WO2006035723A1 - 圧電/電歪膜型素子及びその製造方法 - Google Patents
圧電/電歪膜型素子及びその製造方法 Download PDFInfo
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- WO2006035723A1 WO2006035723A1 PCT/JP2005/017640 JP2005017640W WO2006035723A1 WO 2006035723 A1 WO2006035723 A1 WO 2006035723A1 JP 2005017640 W JP2005017640 W JP 2005017640W WO 2006035723 A1 WO2006035723 A1 WO 2006035723A1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/495—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates
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- H—ELECTRICITY
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- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/07—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base
- H10N30/074—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing
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- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
- H10N30/204—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using bending displacement, e.g. unimorph, bimorph or multimorph cantilever or membrane benders
- H10N30/2047—Membrane type
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- H—ELECTRICITY
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- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/853—Ceramic compositions
- H10N30/8542—Alkali metal based oxides, e.g. lithium, sodium or potassium niobates
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3251—Niobium oxides, niobates, tantalum oxides, tantalates, or oxide-forming salts thereof
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3294—Antimony oxides, antimonates, antimonites or oxide forming salts thereof, indium antimonate
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- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
Definitions
- the present invention relates to a piezoelectric Z electrostrictive membrane element and a method of manufacturing the same, and more specifically, a piezoelectric Z electrostrictive membrane type that exhibits excellent piezoelectric Z electrostrictive characteristics and is environmentally friendly.
- the present invention relates to an element and a manufacturing method thereof.
- a piezoelectric Z electrostrictive element is known as an element capable of controlling a minute displacement on the order of submicrons.
- a piezoelectric Z electrostrictive membrane element in which a piezoelectric Z electrostrictive portion made of a piezoelectric Z electrostrictive composition and an electrode portion to which a voltage is applied is laminated on a substrate that also has a ceramic force is used to control micro displacement
- it has excellent characteristics such as high electromechanical conversion efficiency, high-speed response, high durability, and power saving.
- piezoelectric Z electrostrictive elements include a piezoelectric pressure sensor, a probe moving mechanism of a scanning tunnel microscope, a linear guide mechanism in an ultra-precision machining device, a servo valve for hydraulic control, a head of a VTR device, and a flat panel image display device. It is used for various purposes such as constituting pixels or inkjet printer heads.
- T-type compositions T-type compositions
- piezoelectric Z electrostrictive compositions in which a part of Pb in these compositions is substituted with Sr, La, etc. are disclosed (see, for example, Patent Documents 1 and 2).
- a piezoelectric Z electrostrictive element with excellent piezoelectric Z electrostrictive characteristics (for example, piezoelectric d constant) can be obtained for the piezoelectric Z electrostrictive part itself, which is the most important part that determines the piezoelectric Z electrostrictive characteristics of the strain element It is expected.
- the PZT-based composition inevitably contains lead (Pb).
- Pb lead
- the effects on the global environment, such as the elution of lead (Pb) by acid rain have tended to be regarded as problems.
- piezoelectric ceramics or piezoelectric ceramics that can provide piezoelectric elements that do not contain lead (Pb) and exhibit good piezoelectric Z electrostriction characteristics as piezoelectric Z electrostrictive materials that take into account environmental impacts.
- An electric composition is disclosed (for example, see Patent Documents 3 to 6).
- the piezoelectric body obtained by using the piezoelectric ceramic (or piezoelectric composition) disclosed in Patent Documents 3 to 6 is a PZT system containing lead (Pb). Compared to the piezoelectric Z obtained by using the composition, it is difficult to obtain a large displacement. In contrast, the piezoelectric Z electrostriction characteristics are superior and inferior, the PZT composition is more excellent. Currently. Therefore, there is a need to develop a device that exhibits excellent piezoelectric Z electrostriction characteristics even when it does not contain lead (Pb).
- Patent Document 1 Japanese Patent Publication No. 44-17103
- Patent Document 2 Japanese Patent Publication No. 45-8145
- Patent Document 3 Japanese Patent Laid-Open No. 2003-221276
- Patent Document 4 Japanese Unexamined Patent Publication No. 2003-277145
- Patent Document 5 Japanese Patent Laid-Open No. 2002-68836
- Patent Document 6 Japanese Patent Application Laid-Open No. 2004-244299
- the present invention has been made in view of such problems of the prior art, and the object of the present invention is to exhibit excellent piezoelectric Z electrostrictive characteristics without containing lead (Pb). Another object of the present invention is to provide a piezoelectric Z electrostrictive membrane element capable of obtaining a particularly large displacement and a method for manufacturing the same.
- the present inventors have constituted a piezoelectric Z electrostrictive film with crystal particles made of a piezoelectric Z electrostrictive composition containing a predetermined alkali metal element and a metal element.
- the inventors have found that the above-mentioned problems can be achieved by making the piezoelectric Z electrostrictive film a homogeneous film, and have completed the present invention.
- a piezoelectric Z electrostrictive film is constituted by crystal particles having a predetermined alkali metal element and a piezoelectric element containing a metal element, and an oxide of these alkali metal element and metal element is used as a substrate. It has been found that the above-mentioned problems can be achieved by the inclusion, and the present invention has been completed.
- piezoelectric Z electrostrictive membrane element and a method for manufacturing the same.
- a thin-walled substrate made of ceramics, a lower electrode film disposed on the substrate, a piezoelectric Z electrostrictive film including a large number of crystal particles made of a piezoelectric Z electrostrictive composition, And a piezoelectric Z electrostrictive film type device comprising a piezoelectric Z electrostrictive working unit in which an upper electrode film is sequentially laminated, wherein the piezoelectric Z electrostrictive composition comprises lithium (Li), potassium (K) And one or more alkali metal elements selected from the group consisting of sodium (Na) force, and one selected from the group consisting of niobium (Nb), tantalum (Ta), antimony (Sb), and silver (Ag).
- Piezoelectric 7 electrostrictive membrane element (hereinafter also referred to as “first piezoelectric Z electrostrictive membrane element”).
- composition of the piezoelectric Z electrostrictive composition is represented by the following general formula (1), and the substrate and the piezoelectric Z electrostrictive actuating unit are integrated by firing: Piezoelectric Z electrostrictive membrane element.
- composition according to [1] wherein the composition of the piezoelectric Z electrostrictive composition is represented by the following general formula (2), and the substrate and the piezoelectric Z electrostrictive actuating unit are integrally fired: Piezoelectric Z electrostrictive membrane element.
- composition of the piezoelectric Z electrostrictive composition is represented by the following general formula (3), and the substrate and the piezoelectric Z electrostrictive operation unit are integrated by firing: Piezoelectric Z electrostrictive membrane element.
- the alkali metal element and Z or the metal element are in the form of their respective oxides.
- the concentration of each of the oxide of alkali metal element and Z or the oxide of metal element contained in the substrate is a central portion of the interface between the substrate and the lower electrode film.
- the substrate has The partial force at which each of the alkali metal element oxide and Z or the metal element oxide contained is 0.3X.
- the thickness of the substrate is 10 to 90 from the central portion of the interface.
- the size of the piezoelectric Z electrostrictive film is a size that covers the lower electrode film and an end portion of the piezoelectric Z electrostrictive film projects on the substrate, and the piezoelectric Z electrostrictive film that projects on the substrate.
- the piezoelectric Z electrostrictive film according to any one of [1] to [9], wherein the end portion of the strain film and a portion corresponding to the end portion of the substrate constitute an incompletely coupled state. Type element.
- the size of the piezoelectric Z electrostrictive film is a size that covers the lower electrode film and that an end portion of the piezoelectric Z electrostrictive film projects on the substrate, and the piezoelectric Z electrostrictive film that projects on the substrate.
- the piezoelectric device according to any one of [1] to [9], wherein the end portion of the strained film and the portion corresponding to the end portion of the substrate constitute a state separated by a predetermined interval.
- Z electrostrictive membrane element is a size that covers the lower electrode film and that an end portion of the piezoelectric Z electrostrictive film projects on the substrate, and the piezoelectric Z electrostrictive film that projects on the substrate.
- the direction force of the portion corresponding to the end portion is higher than the concentration in the vicinity of the interface.
- the concentration of the alkali metal element and the metal element is high.
- Piezoelectric electrostrictive membrane element as described in 1.
- the substrate contains alumina (Al 2 O 3), and the substrate includes a front substrate.
- the reaction product of the alkali metal element and the alumina (Al 2 O 3) is unevenly distributed in a portion corresponding to the end portion of the substrate and a portion including the interface between the substrate and the lower electrode film.
- the piezoelectric Z electrostrictive film element according to any one of [10] to [12]. [14] The piezoelectric Z electrostrictive film is formed by firing after the lower electrode film is formed on the substrate, [1] to [13] A piezoelectric Z electrostrictive membrane element according to any one of the above.
- a thin substrate such as a ceramic cover, a lower electrode film disposed on the substrate, a piezoelectric Z electrostrictive film including a large number of crystal particles made of a piezoelectric Z electrostrictive composition, and A piezoelectric Z electrostrictive film type element comprising a piezoelectric Z electrostrictive working unit in which upper electrode films are sequentially laminated, wherein the piezoelectric Z electrostrictive composition comprises lithium (Li), potassium (K), And one or more alkali metal elements selected from the group that also has sodium (Na) force, and one or more selected from the group that includes niobium (Nb), tantalum (Ta), antimony (Sb), and silver (Ag) force (However, the -Ob (Nb) must be contained), and contained in the piezoelectric Z electrostrictive composition, the alkali metal element and Z or the metal element are contained in the substrate.
- Piezoelectric Z electrostrictive film type element hereinafter also referred to as “second piezoelectric Z
- composition of the piezoelectric Z electrostrictive composition is represented by the following general formula (1), and the substrate and the piezoelectric Z electrostrictive actuating portion are integrated by firing.
- composition of the piezoelectric Z electrostrictive composition is represented by the following general formula (2), and the substrate and the piezoelectric Z electrostrictive actuating unit are integrated by firing.
- composition of the piezoelectric Z electrostrictive composition is represented by the following general formula (3), and the substrate and the piezoelectric Z electrostrictive actuating unit are integrated by firing: [18] The piezoelectric Z electrostrictive film type element described.
- the concentrations of the alkali metal element oxide and Z or the metal element oxide contained in the substrate are the center of the interface between the substrate and the lower electrode film.
- the size of the piezoelectric Z electrostrictive film covers the lower electrode film and the end of the piezoelectric Z electrostrictive film projects on the substrate, and the piezoelectric Z electrostrictive film projects on the substrate.
- the size of the piezoelectric Z electrostrictive film is a size that covers the lower electrode film and that an end portion of the piezoelectric Z electrostrictive film projects on the substrate, and the piezoelectric Z electrostrictive film projects on the substrate.
- Z electrostrictive membrane element
- the concentration of the alkali metal element oxide and the metal element oxide is higher in the portion corresponding to the end portion than in the vicinity of the interface.
- [26] or [27] The piezoelectric Z electrostrictive membrane element.
- the substrate contains alumina (Al 2 O 3),
- the reaction product of the alkali metal element and the alumina (Al 2 O 3) is unevenly distributed in a portion corresponding to the end portion of the substrate and a portion including the interface between the substrate and the lower electrode film.
- the piezoelectric Z electrostrictive film element according to any one of [26] to [28].
- a thin substrate such as a ceramic cover, a lower electrode film disposed on the substrate, a piezoelectric Z electrostrictive film including a large number of crystal particles made of a piezoelectric Z electrostrictive composition, and A piezoelectric Z electrostrictive film type element comprising: a piezoelectric Z electrostrictive working part in which upper electrode films are sequentially laminated, wherein the piezoelectric Z electrostrictive composition satisfying the following condition (1) is A method of manufacturing a piezoelectric Z electrostrictive film type device, comprising the step of forming the piezoelectric Z electrostrictive film by arranging and firing in layers on a lower electrode film.
- condition (1) Among the constituent elements contained, one or more alkali metal elements selected from the group consisting of lithium (Li), potassium (K), and sodium (Na) force, and niobium (Nb), tan Try to form one or more of a plurality of raw materials including each of one or more metal elements selected from the group consisting of Tal (Ta), Antimony (Sb), and Silver (Ag) forces
- a general formula force representing the composition of the piezoelectric Z electrostrictive composition constituting the crystal particles contained in the piezoelectric Z electrostrictive film.
- a piezoelectric Z electrode prepared by using more than the theoretically required amount to be calculated. Strain composition.
- the raw material compound is used in an amount of 0.1 to 25% by mass in terms of the alkali metal element and the metal element contained in each of the above-mentioned theoretically required amounts. 34].
- the first and second piezoelectric Z electrostrictive membrane elements of the present invention are highly considered for the environment containing no lead (Pb).
- the first and second piezoelectric Z electrostrictive membrane elements of the present invention transmit the displacement generated in the piezoelectric Z electrostrictive operation portion to the substrate very effectively, and contain lead (Pb). It exhibits excellent piezoelectric Z electrostriction characteristics at least, and has the effect of being able to obtain a particularly large displacement.
- piezoelectric Z electrostrictive membrane element of the present invention high consideration is given to the environment containing no lead (Pb), and excellent piezoelectric Z electrostrictive characteristics are obtained.
- the piezoelectric Z electrostrictive membrane element shown can be easily manufactured.
- FIG. 1 is a partial cross-sectional view schematically showing an embodiment of a piezoelectric Z electrostrictive membrane element of the present invention.
- FIG. 2 is a partial cross-sectional view schematically showing another embodiment of a piezoelectric Z electrostrictive membrane element of the present invention.
- FIG. 3 is a front view showing an application example of the piezoelectric Z electrostrictive membrane element of the present invention to an actuator for a hard disk.
- FIG. 4 is a partial sectional view schematically showing still another embodiment of the piezoelectric Z electrostrictive membrane element of the present invention.
- FIG. 5 is a partial plan view schematically showing still another embodiment of the piezoelectric Z electrostrictive membrane element of the present invention.
- FIG. 6 is a cross-sectional view schematically showing still another embodiment of the piezoelectric Z electrostrictive membrane element of the present invention. is there.
- FIG. 7 is a cross-sectional view schematically showing still another embodiment of the piezoelectric Z electrostrictive membrane element of the present invention.
- FIG. 8 is a cross-sectional view schematically showing still another embodiment of the piezoelectric Z electrostrictive membrane element of the present invention.
- FIG. 9 is a cross-sectional view schematically showing still another embodiment of the piezoelectric Z electrostrictive membrane element of the present invention.
- FIG. 10 is a schematic diagram for explaining the central portion of the interface between the substrate and the lower electrode film and the vicinity of the central portion of the interface.
- the piezoelectric Z electrostrictive film type element of the present invention simply refers to the first piezoelectric Z electrostrictive film type element and the second piezoelectric Z electrostrictive film type element. It also means a gap.
- FIG. 1 is a partial cross-sectional view schematically showing one embodiment of the piezoelectric Z electrostrictive membrane element of the present invention.
- the piezoelectric Z electrostrictive membrane element 1 according to the present embodiment includes a thin substrate 2 having a ceramic force and a piezoelectric Z electrostrictive operating portion 5 disposed on the substrate 2.
- Piezoelectric Z electrostriction The actuating part 5 is formed by sequentially laminating a lower electrode film 3a, a piezoelectric Z electrostrictive film 4 including a large number of crystal particles having a piezoelectric Z electrostrictive composition force, and an upper electrode film 3b.
- the piezoelectric Z electrostrictive film type element 1 of the present embodiment includes a piezoelectric Z electrostrictive composition constituting a large number of crystal particles included in the piezoelectric Z electrostrictive film 4, and lithium (Li), potassium (K), and sodium.
- One or more alkali metal elements selected from the group also comprising (Na) force, and one or more selected from the group consisting of niobium (Nb), tantalum (Ta), antimony (Sb), and silver (Ag). It contains metal elements.
- Niobium (Nb) is always contained.
- the piezoelectric Z electrostrictive film 4 composed of the above-described piezoelectric Z electrostrictive composition containing an alkali metal element and a metal element does not contain these! Compared with the piezoelectric Z electrostrictive film thus constructed, it has a finer microstructure. Therefore, the piezoelectric Z electrostrictive membrane element 1 of the present embodiment exhibits excellent piezoelectric Z electrostrictive characteristics, and can obtain a particularly large displacement.
- the first piezoelectric Z electrostrictive film type element 1 of the present embodiment has a circular equivalent diameter of 90% or more of a large number of crystal particles included in the piezoelectric Z electrostrictive film 4. -50 / ⁇ ⁇ , preferably 1 to 15 ⁇ m, more preferably 2 to 5 ⁇ m.
- the equivalent circle diameter of 90% or more of the crystal grains included in the piezoelectric / electrostrictive film 4 is 0.3 to 50 m, the piezoelectric Z electrostrictive film 4 is compared. It can be said that the film is homogeneous.
- the piezoelectric Z electrostrictive effect of the piezoelectric Z electrostrictive composition constituting the crystal particles is sufficiently exhibited, and the reliability of the piezoelectric Z electrostrictive film 4 is improved. If it is less than 0.3 / zm, the piezoelectric Z electrostriction effect is not sufficiently exhibited. On the other hand, if it is too high, the insulation and bending strength of the piezoelectric Z electrostrictive film will decrease, and the reliability of the piezoelectric Z electrostrictive film type element will decrease.
- the “equivalent circular diameter of crystal grain” refers to the area occupied by the cross section of a polygonal or round crystal grain observed in an arbitrary cross section of the piezoelectric Z electrostrictive film.
- the diameter of a circle with the same area is particularly preferable that the equivalent circle diameter of all of the crystal grains (that is, 100%) is within the above numerical range. It is to be noted that by adjusting and selecting the sintering conditions (firing temperature, holding time, temperature rising rate, etc.) of the piezoelectric Z electrostrictive composition to be used as appropriate, a large number of crystals contained in the piezoelectric Z electrostrictive film are selected.
- the equivalent circle diameter of 90% or more of the grains can be within a predetermined numerical range.
- the substrate 2 is contained in the piezoelectric Z electrostrictive composition, the alkali metal elements (Li, K, Na) described above, and It contains soot or the aforementioned metal elements (Nb, Ta, Sb).
- These alkali metal elements and metal elements may be contained in the substrate 2 in any state, but specifically, they may be contained in the substrate 2 as their respective oxides. I like it.
- Substrate 2 containing an alkali metal oxide does not contain an alkali metal oxide! It occurs in piezoelectric Z electrostrictive actuator 5 which is more flexible than a normal ceramic substrate. Larger displacement that can easily follow the displacement can be obtained.
- the second piezoelectric Z electrostrictive film element 1 of the present embodiment provided with the substrate 2 containing the metal element oxide described above does not contain a metal element oxide.
- a larger displacement can be obtained as compared with a piezoelectric Z electrostrictive membrane element having a ceramic substrate.
- -Ob (Nb), tantalum (Ta), and antimony (Sb) are elements with small ionic radii, and are therefore likely to diffuse inside the substrate 2 at high temperatures. It is presumed that these elements diffused inside the substrate 2 can relieve internal stress accumulated in the substrate 2 and reduce displacement resistance based on the internal stress.
- the circular equivalent diameter of 90% or more of the crystal particles contained in the piezoelectric Z electrostrictive film 4 is 0.3 to 50 / ⁇ ⁇ (that is, the piezoelectric electrostrictive film 4
- the piezoelectric electrostrictive membrane element 1 of this embodiment in which the substrate 2 contains an alkali metal element or a metal element contained in the piezoelectric electrostrictive composition is:
- the piezoelectric electrostrictive effect inherent in the piezoelectric electrostrictive composition is sufficiently exhibited. Therefore, the piezoelectric electrostrictive membrane element of the present embodiment that satisfies the requirements (1) and (2) at the same time exhibits synergistic effects based on the requirements and obtains a better bending displacement. Can do.
- the piezoelectric electrostrictive membrane element 1 of the present embodiment is such that the composition of the piezoelectric electrostrictive composition constituting the piezoelectric electrostrictive film 4 is represented by the following general formula (1): It is preferable that the substrate 2 and the piezoelectric electrostrictive operation unit 5 are integrally fired.
- the piezoelectric Z electrostrictive film type element 1 of the present embodiment is such that the composition of the piezoelectric Z electrostrictive composition constituting the piezoelectric Z electrostrictive film 4 is represented by the following general formula (2).
- the substrate 2 and the piezoelectric Z electrostrictive working part 5 are fired and integrated.
- the piezoelectric Z electrostrictive film element 1 of the present embodiment is such that the composition of the piezoelectric Z electrostrictive composition constituting the piezoelectric Z electrostrictive film 4 is represented by the following general formula (3).
- the substrate 2 and the piezoelectric Z electrostrictive working part 5 are fired and integrated.
- the piezoelectric Z electrostrictive film type element 1 of the present embodiment in which the substrate 2 and the piezoelectric Z electrostrictive actuating unit 5 are integrated by firing uses, for example, an adhesive, and an adhesive layer.
- the displacement generated in the piezoelectric Z electrostrictive film 4 and the piezoelectric Z electrostrictive actuator 5 is accurately transmitted to the substrate 2, compared to the case where the substrate and the piezoelectric Z electrostrictive actuator 5 are fixed together via And large displacement can be obtained.
- the piezoelectric Z electrostrictive film 4 is literally formed into a thin film, a sufficiently large displacement can be obtained even if the piezoelectric Z electrostrictive composition does not contain lead (Pb). It is excellent in the environment and has sufficient consideration for the environment.
- the substrate 2 of the piezoelectric Z electrostrictive membrane element 1 of the present embodiment is formed by sintering particles made of ceramic, an oxide of an alkali metal element or an oxide of a metal element May be contained inside the particles, or may exist between adjacent particles (grain boundaries). In any case, a sufficient displacement can be obtained, but it is preferable that these oxides are contained in the particles because a larger displacement can be obtained.
- the alkali metal element oxide and the metal element oxide contained in the substrate 2 are alkali metal elements contained in the piezoelectric Z electrostrictive composition constituting the piezoelectric Z electrostrictive film 4. And derived from metal elements. That is, the alkali metal contained in the piezoelectric Z electrostrictive composition (or The oxide) and the metal element (or the oxide) gradually move to the substrate 2 through the lower electrode film 3a and are contained in the substrate 2 as an oxide. Become. Therefore, in the piezoelectric Z electrostrictive film type element 1 of the present embodiment, the piezoelectric Z electrostrictive film 4 is formed by firing after the lower electrode film 3a is formed on the substrate 2. This is preferable because the substrate 2 contains an oxide of an alkali metal and an oxide of a metal element derived from the piezoelectric Z electrostrictive composition. The lower electrode film 3a is preferably formed by firing.
- the oxide of the alkali metal element and the oxide of the metal element contained in the substrate 2 are both oxides that can be identified by chemical analysis. Therefore, alkali metal elements and metal elements are contained in the substrate 2 in a manner that cannot be identified by chemical analysis, or in a state of solid solution with other elements in the substrate 2. There may be cases.
- the concentrations of the alkali metal element oxide and Z or metal element oxide contained in the substrate 22 are determined from the central portion 65 of the interface between the substrate 22 and the lower electrode film 23a. It is preferable that the diameter gradually decreases gradually as it proceeds in the thickness direction of 22 (see FIG. 10). That is, the strength of each of the oxide of the alkali metal element and the oxide of the metal element is a concentration that gradually decreases radially from the surface on which the piezoelectric Z electrostriction actuating unit is disposed to the surface opposite to the surface on which this element is disposed. It is preferably contained in the substrate 22 with a gradient.
- the central part of the interface between the substrate and the lower electrode film refers to a case where element analysis is performed using a general electron beam microphone analyzer (EPMA) as shown in FIG.
- EPMA electron beam microphone analyzer
- the smallest area that can be measured with this EPMA resolution the area indicated by reference numeral 65 in FIG. 10). More specifically, the 500 X 500 X 500nm area!
- the concentration of the oxide of the alkali metal element contained in the vicinity 68 of the central part of the interface between the substrate 22 and the lower electrode film 23a is X
- the alkali metal element contained in the substrate 22 It is preferable that the portion where the concentration of acid oxides in this region becomes 0.3X is the portion where the central force of this interface corresponds to the distance of 10 to 90% of the thickness of the substrate 22. The distance of 20 to 60% Equivalent to More preferably, it is a portion to be used.
- the concentration of the metal element oxide contained in the vicinity 68 of the central portion 68 of the interface is X
- the partial force at which the concentration of the metal element oxide contained in the substrate 22 is 0.3X.
- a portion corresponding to a distance of 10 to 90% of the thickness of the substrate 22 from the central portion of the interface is preferable, and a portion corresponding to a distance of 20 to 60% is more preferable.
- the portion where the concentration of the alkali metal element oxide and metal element oxide contained in the substrate 22 is 0.3X is less than 10% of the thickness of the substrate 22 from the center of the interface. If the portion corresponds to the distance, the effect produced by the concentration gradient tends to be insufficient. On the other hand, if it is a portion corresponding to a distance exceeding 90%, the strength of the substrate 22 becomes insufficient, and the displacement characteristics tend to deteriorate.
- “the vicinity of the central portion of the interface” means “the central portion of the interface between the substrate and the lower electrode film” as described above, the alkali metal element acid and metal element. This refers to the region where the concentration of acid is the same.
- the piezoelectric Z electrostrictive film type element 1 of the present embodiment has a size of the piezoelectric Z electrostrictive film 4 covering the lower electrode film 3a and its end (overhanging).
- the end 10) has a size that protrudes on the substrate 2, and the protruding end 10 that protrudes on the substrate 2 and the portion corresponding to the protruding end 10 of the substrate 2 (extended end corresponding portion B)
- the incompletely coupled portion 30 constitutes an incompletely coupled state.
- the protruding end corresponding portion B of the substrate 2 has an alkali metal element oxide and metal.
- the concentration of each elemental acid is high.
- Alkali metal elements and metal elements contained in the piezoelectric Z electrostrictive composition gradually move to the substrate 2 by firing, and, for example, in the state of these oxides, at a predetermined location in the substrate 2. Presumed to be unevenly distributed. That is, when these oxides are unevenly distributed in the overhanging end corresponding part B of the substrate 2 in particular, they are separated from the piezoelectric Z electrostriction actuating part 5 and are relatively unlikely to be displaced. Even the overhanging end-corresponding portion B, which is assumed to be, can be displaced flexibly, and a higher displacement can be obtained.
- the "incompletely bonded state" in the present specification is a state in which at least a part of the overhanging end portion is bonded to the substrate, or a state in which the bonded portion is not bonded at all. Let's do that. Specifically, the bond between the overhang end and the substrate is incomplete, and piezoelectric Z electrostriction is activated. This means that the part is in a combined state that can sufficiently perform the required performance. More specifically, peel between overhanging end and the substrate (peeling) der Rukoto preferably 0. 5kgZ4mm 2 or less in strength, it is more preferably is 0. lkgZ4mm 2 below instrument 0.
- 05kg / 4mm 2 (here, “4 mm 2 ” means 2 mm square) is particularly preferable. Therefore, even if the portion where the overhanging end portion and the substrate are in contact with each other is not required to be in an incompletely bonded state, the total strength is less than the predetermined strength.
- the incompletely coupled portion forms a dummy layer between the protruding end portion and the substrate so as not to be in direct contact with each other, and this dummy layer is interposed therebetween.
- a piezoelectric Z electrostrictive film may be formed.
- the dummy layer is a layer formed of a material that burns and disappears by a predetermined heat treatment, such as a resin material, and an incompletely bonded portion is formed after the disappearance. If the dummy layer functions as a sufficient insulator after the prescribed heat treatment and the bonding state between the overhanging end and the substrate is the above-mentioned incomplete bonding state, it will not burn or disappear completely! ⁇ It is also possible to use materials.
- the piezoelectric Z electrostrictive film type element 51 of the present embodiment has a size of the piezoelectric Z electrostrictive film 14 covering the lower electrode film 13a and its end (overhang The end 60) has a size that projects on the substrate 12, and the projecting end 60 projecting on the substrate 12 and the portion corresponding to the projecting end 60 of the substrate 12 (projecting end corresponding portion B) It is preferable that a so-called separated space 20 is interposed between them so as to constitute a separated state separated by a predetermined interval.
- the overhanging end portion 60 can flexibly displace the substrate 12 in which the displacement of the substrate 12 is not easily inhibited. Higher displacement can be obtained.
- the protruding end corresponding portion B of the substrate 12 has an oxide of an alkali metal element and a metal element. Each oxide concentration is high, It is preferable. Alkali metal elements and metal elements contained in the piezoelectric Z electrostrictive composition gradually move to the substrate 2 by firing, and are unevenly distributed at predetermined locations in the substrate 2 in the state of these oxides, for example.
- reference numeral 13b denotes an upper electrode film.
- the piezoelectric Z electrostrictive film type element 1 (see FIG. 1) of the present embodiment has a substrate 2 containing alumina (Al 2 O 3), and a protruding end corresponding portion B in the substrate 2. And substrate 2
- the product is unevenly distributed in layers. If the reaction product of alkali metal elements and alumina (Al 2 O 3) is unevenly distributed in these portions, the dense contact between the substrate 2 and the lower electrode film 3a will occur.
- the piezoelectric Z electrostrictive membrane element of the present invention is used, it is possible to obtain a hard disk activator as shown in FIG. 3, for example. That is, the node disk actuator shown in FIG. 3 includes a ceramic body 40 having an arm portion 31 and a piezoelectric Z electrostriction operating portion 32 disposed on the arm portion 31. 31 is an actuator that functions as a diaphragm and has the desired good vibration characteristics.
- the thickness of the piezoelectric Z electrostrictive film is preferably 0.5 to 50 ⁇ m, and preferably 0.8 to 40 / ⁇ ⁇ . Further preferred is 1.0 to 30 / ⁇ ⁇ . If the thickness of the piezoelectric / electrostrictive film is less than 0.5 m, a dense film may not be obtained. On the other hand, if the thickness of the piezoelectric Z electrostrictive film exceeds 50 m, the piezoelectric z The shrinkage stress of the electrostrictive composition is increased and the substrate is prevented from being destroyed. Therefore, it is necessary to make the substrate thicker, and it may be difficult to cope with the downsizing of the device.
- the substrate constituting the piezoelectric Z electrostrictive membrane element of the present embodiment also has a ceramic force, but there is no particular limitation on the type of ceramic.
- stabilized acid-zirconium, acid-aluminum, acid-magnesium, mullite, aluminum nitride, silicon nitride, and glass power Ceramics containing at least one selected from the group are preferred.
- stabilized zirconium oxide is more preferable from the viewpoint of high mechanical strength and excellent toughness.
- stabilized acid-zirconium refers to acid-zirconium in which the phase transition of the crystal is suppressed by adding a stabilizer. In addition to zirconium, partially stabilized zirconium oxide is included.
- a stabilizer to acid zirconium for example, calcium oxide, magnesium oxide, yttrium oxide, scandium oxide, terbium oxide, cerium oxide, Or the thing containing 1-30 mol% of rare earth metal oxides can be mentioned.
- those containing yttrium oxide as a stabilizer are preferred in that the mechanical strength of the vibration part is particularly high.
- yttrium oxide is preferably contained in an amount of 1.5 to 6 mol%, more preferably 2 to 4 mol%. Further, it is preferable to contain 0.1 to 5 mol% of acid aluminum.
- the stabilized crystalline phase of zirconium oxide may be a cubic + monoclinic mixed phase, a tetragonal + monoclinic mixed phase, a cubic + tetragonal + monoclinic mixed phase, etc.
- the main crystal phase is preferably a tetragonal crystal or a mixed phase of tetragonal crystal + cubic crystal from the viewpoints of strength, toughness, and durability.
- the ceramic constituting the substrate contains aluminum (A1).
- aluminum (A1) is contained in the ceramics that constitute the substrate, the alkali metal oxides and metal oxides are likely to diffuse into the substrate, and at suitable locations within the substrate. It tends to be unevenly distributed.
- the aluminum (A1) content is preferably 0.01% by mass or more, and preferably 0.01-2% by mass.
- the thickness of the substrate is preferably 1 ⁇ m to lmm, and more preferably 1.5 to 500 ⁇ m. 2 ⁇ 200 / ⁇ m is particularly preferred. If the thickness of the substrate is less than 1 ⁇ m, the mechanical strength of the piezoelectric Z electrostrictive membrane element may be reduced. On the other hand, if it exceeds 1 mm, the substrate stiffness against the contraction stress that occurs when a voltage is applied to the piezoelectric Z electrostrictive film may increase, and the bending displacement of the piezoelectric Z electrostrictive film may decrease. .
- the surface shape of the substrate (the shape of the surface to which the lower electrode film 3a is fixed in FIG. 1).
- a surface shape such as a rectangular shape or a composite shape obtained by combining these shapes can be given.
- the shape of the entire substrate may be a capsule shape having an appropriate internal space without any particular limitation.
- Examples of the material of the lower electrode film and the upper electrode film include at least one metal selected from the group consisting of Pt, Pd, Rh, Au, Ag, and alloys thereof.
- platinum or an alloy containing platinum as a main component is preferable in terms of high heat resistance when the piezoelectric Z electrostrictive film is fired.
- An alloy such as Ag—Pd can also be suitably used.
- the lower electrode film is composed of platinum or an alloy containing platinum as a main component, the alkali metal element oxide or metal element oxide easily diffuses into the substrate.
- gold is preferable because it becomes a synthesis catalyst for the reaction product of alkali metal and alumina, and the reaction product is likely to be unevenly distributed at a suitable location in the substrate.
- the thicknesses of the lower electrode film and the upper electrode film are each preferably 15 m or less, and more preferably 5 m or less. If it exceeds 15 m, the electrode film may act as a relaxation layer and the bending displacement may be reduced. From the viewpoint of exhibiting a substantial electrode function, the thickness of the lower electrode film and the upper electrode film may be 0.05 m or more, respectively.
- the piezoelectric Z electrostrictive operation part 35 of the piezoelectric Z electrostrictive film type element of this embodiment includes a lower electrode film 23a, a first piezoelectric Z electrostrictive film 24a, and an internal electrode.
- a so-called multilayer structure including the film 23c, the second piezoelectric Z electrostrictive film 24b, and the upper electrode film 23b is also preferable because a larger displacement can be obtained.
- the piezoelectric Z electrostriction operating portion 35 has such a multilayer structure, as shown in FIG.
- the lower electrode terminal 50a connected to the lower electrode film 23a, the internal electrode terminal 50c connected to the internal electrode film, and the upper electrode terminal Upper part connected to electrode film 23b It is preferable to adopt a wiring pattern when the electrode terminal 50b is disposed and the insulating layer 70 made of an insulating material such as glass is disposed between the upper electrode terminal 50b and the lower electrode terminal 50a. . That is, by forming a three-dimensional wiring pattern through the insulating layer 70, the upper electrode terminal 50b and the lower electrode terminal 50a can be insulated and electrically independent from each other.
- the insulating layer may be interposed between the upper electrode terminal and the lower electrode terminal to insulate the upper electrode terminal from the lower electrode terminal. Yes.
- Such a configuration is preferable in that the film forming process such as screen printing can be reduced.
- FIG. 6 is a cross-sectional view schematically showing still another embodiment of the piezoelectric Z electrostrictive membrane element of the present invention.
- a piezoelectric Z-electric current is formed by sequentially laminating a lower electrode film 23a, a piezoelectric Z electrostrictive film 14, and an upper electrode film 23b on the surface (fixed surface 82) of the substrate 22 having the cavity 80.
- a strain actuating part 35 can also be provided.
- the lower electrode film 23a, the first piezoelectric Z electrostrictive film 24a, the internal electrode film 23c, and the second piezoelectric film are formed on the surface (fixed surface 82) of the substrate 22 having the cavity 80.
- a so-called multi-layer piezoelectric Z electrostrictive actuator 35 having a Z electrostrictive film 24b and an upper electrode film 23b may be provided.
- the lower electrode film 23a and the first piezoelectric Z electrostrictive film are formed on the surface (fixed surface 82) of the substrate 22 having the cavity 80 in which the predetermined hole 81 is formed.
- a so-called multi-layered piezoelectric Z electrostrictive actuating portion 35 including 24a, an internal electrode film 23c, a second piezoelectric Z electrostrictive film 24b, and an upper electrode film 23b may be provided.
- the substrate 22 has a thin portion 83 and a thick portion 84, and a piezoelectric Z electrostriction operating portion is formed on the surface (adhesion surface 82) of the thin portion 83. 35 can also be provided.
- the manufacturing method of the piezoelectric Z electrostrictive film type element of this embodiment includes a thin substrate made of ceramics, a large number of crystals comprising a lower electrode film and a piezoelectric Z electrostrictive composition disposed on the substrate.
- This is a method of manufacturing a piezoelectric Z electrostrictive film type element comprising a piezoelectric Z electrostrictive film containing particles and a piezoelectric Z electrostrictive working part in which an upper electrode film is sequentially laminated.
- a piezoelectric Z electrostrictive composition satisfying the following condition (1) is disposed and baked on the lower electrode film in a layered manner. A film is formed.
- Condition (1) Among the constituent elements contained, one or more alkali metal elements selected from the group consisting of lithium (Li), potassium (K), and sodium (Na) force, and niobium (Nb) Forming one or more of a plurality of raw materials including each of one or more metal elements selected from the group consisting of tantalum (Ta), antimony (Sb), and silver (Ag)
- the piezoelectric Z electrostrictive composition prepared by using more than the theoretical amount calculated from the general formula representing the composition of the piezoelectric Z electrostrictive composition constituting the crystal particles contained in the piezoelectric Z electrostrictive film object.
- the conventional piezoelectric z electrostrictive composition is composed of individual elements constituting the element, oxides and carbonates of these elements.
- the piezoelectric Z electrostrictive composition used in the manufacturing method of the piezoelectric Z electrostrictive membrane element of the present embodiment is lithium among the constituent elements contained therein.
- General formula force representing the composition Prepare by using more than the theoretical required amount to be calculated. In this way, by using more specific constituent elements than theoretically required, it is possible to include oxides of alkali metal elements and oxides of Z or metal elements in the substrate.
- the general formula force representing the composition of the piezoelectric Z electrostrictive composition constituting the crystal particles included in the piezoelectric Z electrostrictive film to be formed is determined according to the theoretically required amount calculated.
- a piezoelectric Z electrostrictive film type device is used for temporary fabrication (first step).
- the composition of the piezoelectric Z electrostrictive composition constituting the crystal particles contained in the formed piezoelectric Z electrostrictive film can be set to a desired general formula. Further, the amount of alkali metal element or metal element contained in the substrate can be adjusted to a desired amount.
- the raw material compound is preferably used in an amount of 0.1 to 25% by mass in terms of the alkali metal element and the metal element contained in each of them compared to the theoretically required amount.
- raw material compounds containing alkali metal elements or niobium (Nb) are 15% by mass or less in terms of the elements contained in them (in terms of Li, K, Na, or Nb) rather than the theoretically required amounts. It is more preferable to use 1 to 5% by mass. If the surplus amount of these raw material compounds exceeds 15% by mass in terms of elements, the amount of alkali metal oxide or niobium (Nb) oxide contained in the substrate becomes excessive, and the strength of the substrate is reduced. It tends to be short.
- the raw material compounds containing tantalum (Ta), antimony (Sb), or silver (Ag) are converted into the elements contained in them (Ta, Sb, or Ag conversion) rather than the theoretical amount required. It is preferable to use more than 25% by mass and more preferably 5 to 20% by mass. If the surplus amount of these raw materials is more than 25% by mass in terms of element, the amount of tantalum (Ta) oxide or antimony (Sb) oxide contained in the substrate becomes excessive, The strength of the substrate tends to be insufficient.
- a general method may be used, for example, a ball mill.
- a predetermined amount of various raw materials / compounds, cobblestones, and a dispersion medium (water, organic solvent) are placed in a ball mill apparatus and rotated for a predetermined time to prepare a mixed slurry. Thereafter, the mixed raw material can be obtained by removing the dispersion medium (water, organic solvent) contained in the obtained mixed slurry by evaporating, drying, filtering and the like.
- a piezoelectric Z electrostrictive composition can be obtained by calcining the obtained mixed raw material. Calcination may be performed in an oxygen atmosphere or an oxygen atmosphere.
- the ratio of the intensity of the strongest diffraction line of the phase other than the perovskite phase to the intensity of the strongest diffraction line of the perovskite phase is 5% in the diffraction intensity by the X-ray diffractometer. It is more preferable that it is 2% or less.
- a particulate (or powder) piezoelectric Z electrostrictive composition is obtained.
- the average particle diameter of the particulate piezoelectric Z electrostrictive composition is 0.1 to 1. O / z m, preferably S, and more preferably 0.2 to 0.7 m.
- the particle size may be adjusted by heat-treating the powder of the piezoelectric Z electrostrictive composition obtained by pulverization at a predetermined temperature.
- the piezoelectric Z electrostrictive composition may be prepared by, for example, an alkoxide method or a coprecipitation method. Further details of the method for preparing the piezoelectric Z electrostrictive composition are described in Patent Documents 3 to 6 described above.
- a lower electrode film is formed on a thin substrate having ceramic force.
- the method for forming the lower electrode film include ion beam, sputtering, vacuum deposition, PVD, ion plating, CVD, plating, aerosol deposition, screen printing, spraying, and dipping. it can.
- the sputtering method or the screen printing method is preferable from the viewpoint of the bondability between the substrate and the piezoelectric Z electrostrictive film.
- the formed lower electrode film is selected at an appropriate temperature depending on its material, but can be integrated with the substrate by heat treatment at about 800 to 1400 ° C.
- a piezoelectric Z electrostrictive composition is disposed in layers on the lower electrode film.
- Examples of the method of arranging the piezoelectric Z electrostrictive composition in a layered manner on the lower electrode film include ion beam, sputtering, vacuum deposition, PVD, ion plating, CVD, plating, sol-gel, and aerosol deposition. Examples include position, screen printing, spraying, or datebing. Above all, the screen printing method is preferred because it can be easily and continuously arranged with high precision shape and thickness.
- the firing temperature is preferably 950 to 1350 ° C, more preferably 1000 to 1300 ° C.
- the maximum temperature holding time during firing is preferably 10 minutes or longer and 10 hours or shorter, more preferably 20 minutes or longer and 5 hours or shorter. Firing may be carried out in the air or in an oxygen atmosphere.
- the alkali metal element used As the amount of the alkali metal element used is larger, firing can be performed at a lower temperature. In order to sufficiently contain the oxide of the alkali metal element or the oxide of the metal element in the substrate, it is preferable to hold the substrate at the highest temperature for an appropriate time during firing. What is necessary is just to set suitably the time hold
- the oxide of the alkali metal element or the oxide of the metal element contained in the substrate The concentration gradient can be controlled.
- the heating rate during firing is preferably 10 to 600 ° C / h, more preferably 100 to 300 ° C / h! / ,. By adjusting the heating rate, the positional relationship between the overhang end portion and the overhang end portion corresponding portion can be in an incompletely coupled state or a separated state.
- the piezoelectric Z electrostrictive composition when the piezoelectric Z electrostrictive composition is disposed in layers, the first layer having a high organic matter content and a low powder filling rate, and the second layer having a low organic matter content and a high powder filling rate compared to the first layer.
- the powder filling rate of the first layer the positional relationship between the overhang end portion and the overhang end portion corresponding portion can be in an incompletely coupled state or a separated state.
- an upper electrode film is formed on the piezoelectric Z electrostrictive film.
- the method for forming the upper electrode film is the same as the method for forming the lower electrode film.
- polarization treatment is performed under appropriate conditions. In that case, it is preferable to carry out the polarization treatment by heating as in a known method.
- the heating temperature is preferably 40 to 200 ° C. depending on the Curie point of the piezoelectric Z electrostrictive yarn and the composite.
- [Bending displacement] The bending displacement m) generated when a voltage was applied between the upper and lower electrode films so that the electric field was 3 kVZmm was measured with a laser displacement measuring instrument.
- the “average” of “flexural displacement (zm)” is the value when 10 piezoelectric Z electrostrictive membrane elements of the example and comparative example are manufactured and their flexural displacement is measured.
- the “variation” is the difference between the maximum and minimum measured bending displacements.
- the elastic modulus of the Z electrostrictive film is E
- the thickness of the substrate is t
- the elastic modulus of the substrate is E
- the thickness of the electrode is t
- [0103] [Circular equivalent diameter of 90% or more of crystal particles]: Image analysis using SEM of any cut surface of piezoelectric Z electrostrictive film, and each crystal particle made of piezoelectric Z electrostrictive composition Measure the occupied area. Next, the diameter of the circle having the same area as the measured occupied area was calculated as the “equivalent circle diameter” of the crystal particle, and the “equivalent circle diameter of 90% or more crystal particle” was calculated.
- a lower electrode film (1.2 ⁇ 0.8 mm ⁇ thickness 3 m) was formed by screen printing and integrated with the substrate by heat treatment at 1300 ° C. for 2 hours.
- a piezoelectric Z electrostrictive composition represented by a predetermined composition formula was laminated with a size of 1.3 X 0.9 mm X thickness of 15 m by a screen printing method.
- the piezoelectric Z electrostrictive composition was laminated by printing twice (1) with the organic content of the first layer increased by 10% by mass than the organic content of the second layer (separated state), (2) —An organic matter content (incompletely bonded state) in which the organic content in the second layer and the organic content in the second layer are the same was prepared.
- the piezoelectric Z electrostrictive film was formed by firing at 1200 ° C. for 3 hours (Examples 20 to 25, Comparative Examples 4 and 5) or 1000 ° C. for 3 hours (Examples 26 and 27).
- an upper electrode film (1.2 X 0.8 mm X thickness 0.5 m) made of gold (Au) was laminated by a screen printing method and heat-treated, so that the piezoelectric Z Electrostrictive membrane elements (Examples 1 to 8, Comparative Examples 1 and 2) were produced.
- Table 8 shows the composition formula of the piezoelectric Z electrostrictive composition constituting each of the formed piezoelectric Z electrostrictive films.
- the substrates of the piezoelectric Z electrostrictive membrane elements of Examples 1 to 8 contained an oxide of an alkali metal element and an oxide of a metal element.
- Table 1 shows the measurement results of the bending displacement and the durability evaluation results of the obtained piezoelectric / electrostrictive membrane element.
- Example 1 Incompletely bonded state 1.13 0.07> 1000h
- Example 2 Separated state 1.3 0.07> 900h
- Example 3 Incompletely coupled state 1.2 0.09> 1000h
- Example 4 Separated state 1.35 0.09> 900h
- Example 5 Incompletely bonded state 1.19 0.09> 1200h
- Example 6 Separated state 1.4 0.09> 1000h
- Example 7 Incompletely coupled state 2 0.09> 1200h
- Example 8 Separated state 2.2 0.09> 1000h Comparative example 1 Incompletely coupled state 0.89 0.13 ⁇ 1 ⁇
- a lower electrode film (1.2 ⁇ 0.8 mm ⁇ thickness 3 m) was formed by screen printing and integrated with the substrate by heat treatment at 1300 ° C. for 2 hours.
- Raw material compounds containing potassium (K), sodium (Na), niobium (Nb), and tantalum (Ta) on the lower electrode film are calculated from the general formula ((Li K Na) (Nb Ta) 0) Compared to the theoretical requirement
- Piezoelectric Z electrostrictive compositions obtained by using 3% by mass more in terms of elements are laminated with a dimension of 1.3 X 0.9 mm X thickness 15 / zm by screen printing, and 1000 ° C, baked for 3 hours. Furthermore, an upper electrode film (1.2 X 0.8 mm X thickness 0.5 m) made of gold (Au) is laminated thereon by a screen printing method and heat-treated, so that a piezoelectric Z electrostrictive film type element is obtained. (Example 9) was produced.
- a raw material compound containing tantalum (Ta) is represented by a general formula “(Li K Na) (Nb Ta) 0
- the piezoelectric Z electrostrictive membrane element (implemented in the same manner as in Example 9 above) except that 15% by mass in terms of element was used in comparison with the theoretical required amount calculated from Example 10) Built.
- the concentration of tantalum (Ta) oxide contained in the substrate of the obtained piezoelectric Z electrostrictive film type device was measured for each position in the substrate. The results are shown in Table 3.
- Table 3 shows the measurement results of bending displacement. “Tantalum (Ta) oxide concentration (relative value)” in Table 3 indicates the tantalum contained in the vicinity of the interface between the substrate and the lower electrode film (position from the interface (m): 0). (Ta) Relative value where the concentration of acid oxide is “100”.
- a raw material compound containing potassium ( ⁇ ) is represented by a general formula “(Li K Na) (Nb Ta) 0”.
- Example 11 0.5 7 1.40 10 1.69 30 1.80
- Example 12 3 10 1.68 40 2.00 75 1.55
- Example 13 5 10 1.69 50 2.00> 100 1.05
- Example 14 30 24 1.13> 100 1.10> 100 0.96
- the raw materials containing potassium ( ⁇ ), sodium (Na), niobium (Nb), and tantalum (Ta) are theoretically calculated from the general formula “(Li K Na) (Nb Ta) 0”.
- the piezoelectric Z electrostrictive composition was laminated by printing twice: (1) the organic content of the first layer was 10% by mass higher than the organic content of the second layer (separated state); 2) The same organic content in the first layer and organic content in the second layer (incompletely bonded state) were prepared.
- Concentration of potassium (K) oxide contained in the substrate of the obtained piezoelectric Z electrostrictive membrane element Force of potassium (K) oxide contained in the vicinity of the interface between the substrate and the lower electrode film Table 5 shows the results of measuring the distance from the interface at 0.3X with respect to degree X. Table 5 shows the measurement results of bending displacement and the evaluation results of durability.
- Example 15 1000 Incomplete connection 60 2.0> 1200h
- Example 16 1000 Separation 50 2.2> 1000h
- the piezoelectric Z electrostrictive film type was the same as in Example 15 except that the amount of use of the raw material compound containing potassium (K) (surplus amount) and the firing temperature were changed as shown in Table 6. Devices (Examples 17 to 21) were manufactured.
- the concentration of the oxide of potassium (K) contained in the substrate of the obtained piezoelectric Z electrostrictive film type element is the same as that of the force lithium (K) contained in the vicinity of the interface between the substrate and the lower electrode film.
- Table 6 shows the results of measuring the distance from the interface at 0.3X for the concentration X of the oxide.
- Table 6 shows the measurement results of bending displacement and the evaluation results of substrate strength.
- Example 17 30 1000 100 1.1 ⁇ Example 18 3 1000 50 2.0 ⁇ Example 19 1 1000 20 1.8 ⁇ Example 20 0.5 1000 10 1.2 ⁇ Example 21 0 900 0 1.0 ⁇
- a lower electrode film (1.2 ⁇ 0.8 mm ⁇ thickness 3 m) was formed by screen printing and integrated with the substrate by heat treatment at 1300 ° C. for 2 hours.
- Piezoelectric Z electrostrictive yarns and composites represented by “0.49 0.45 0.991 0.92 0.08 3” were laminated in a size of 1.3 X 0.9 mm X thickness 15 m by screen printing.
- a piezoelectric Z electrostrictive film was formed by firing under the firing conditions shown in Table 7.
- an upper electrode film (1.2 X 0.8 mm X thickness 0.5 m) made of gold (Au) was laminated by a screen printing method and heat-treated, Piezoelectric Z electrostrictive membrane elements (Examples 22 to 28) were manufactured.
- Measurement results of the average size of crystal particles contained in the piezoelectric Z electrostrictive film, the equivalent circle diameter of 90% or more of the crystal particles, and the bending displacement of the obtained piezoelectric Z electrostrictive film type element Are shown in Table 7.
- Example 22 1 0. 06 N a 0. 49 I ⁇ o. 45) 0. 99 1 (Nb 0. 92 a o. 08). & 3 0.5 90 (TCX10niin 0 ⁇ 3 0.5 1.8
- Example 23 (L i o 06 N a o 9 K 0 45 o 99 i (Nb 0 92 T a 0 os) O 3 0.5 950: x20iiiin 1 3 2.1
- Example 24 (L i o. 06 N a 0. 49 K0. 45) 0.99 1 (Nbo. 92 Ta 0 .os) O 3 0.5 950t: X3h 2 5 2.2
- Example 25 (L i o.
- any piezoelectric Z electrostrictive film type element has a sufficient displacement and substrate strength.
- the piezoelectric Z electrostrictive membrane elements of Examples 24 and 25 in which the equivalent diameter of 90% or more of crystal grains is 2 to 5 m have particularly large bending displacement.
- the piezoelectric Z electrostrictive membrane element of the present invention has excellent piezoelectric Z electrostrictive characteristics, and is suitable for an actuator, a sensor, and the like.
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Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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JP2006537727A JP4927551B2 (ja) | 2004-09-29 | 2005-09-26 | 圧電/電歪膜型素子及びその製造方法 |
EP20050785975 EP1796183A4 (en) | 2004-09-29 | 2005-09-26 | PIEZOELECTRICITY / ELECTROSTRUCTURE FILM ELEMENT AND METHOD OF MANUFACTURING THEREOF |
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JP2004284307 | 2004-09-29 | ||
JP2004284316 | 2004-09-29 | ||
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JP2004-284307 | 2004-09-29 | ||
US65948405P | 2005-03-08 | 2005-03-08 | |
US60/659,484 | 2005-03-08 |
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Cited By (10)
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JP2008156210A (ja) * | 2006-12-22 | 2008-07-10 | Ngk Insulators Ltd | (Li,Na,K)(Nb,Ta)O3系圧電材料の製造方法 |
JP2009010367A (ja) * | 2007-05-30 | 2009-01-15 | Canon Inc | 圧電素子、圧電素子の製造方法、圧電アクチュエータおよびインクジェット式記録ヘッド |
JP2009102221A (ja) * | 2007-10-03 | 2009-05-14 | Ngk Insulators Ltd | 圧電/電歪磁器組成物及び圧電/電歪素子 |
JP2009114049A (ja) * | 2007-10-19 | 2009-05-28 | Ngk Insulators Ltd | 圧電/電歪磁器組成物及び圧電/電歪素子 |
JP2009206329A (ja) * | 2008-02-28 | 2009-09-10 | Seiko Epson Corp | 圧電素子およびその製造方法、圧電アクチュエータ、並びに、液体噴射ヘッド |
JP2010030809A (ja) * | 2008-07-28 | 2010-02-12 | Ngk Insulators Ltd | (Li,Na,K,Bi)(Nb,Ta)O3系圧電材料及びその製造方法 |
US8124047B2 (en) | 2006-12-22 | 2012-02-28 | Ngk Insulators, Ltd. | Method for manufacturing (Li, Na, K)(Nb, Ta)O3 type piezoelectric material |
WO2012141104A1 (ja) * | 2011-04-14 | 2012-10-18 | 株式会社村田製作所 | 強誘電体薄膜およびその製造方法 |
WO2013094368A1 (ja) * | 2011-12-20 | 2013-06-27 | 太陽誘電株式会社 | 圧電デバイス及び圧電磁器組成物 |
JP2016139643A (ja) * | 2015-01-26 | 2016-08-04 | Tdk株式会社 | 圧電薄膜素子、圧電アクチュエータ、圧電センサ、並びにハードディスクドライブ、及びインクジェットプリンタ装置 |
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US7477004B2 (en) * | 2004-09-29 | 2009-01-13 | Ngk Insulators, Ltd. | Piezoelectric/electrostrictive porcelain composition, piezoelectric/electrostrictive article, and piezoelectric/electrostrictive film type element |
US7956518B2 (en) | 2007-10-03 | 2011-06-07 | Ngk Insulators, Ltd. | Piezoelectric/electrostrictive ceramic composition and piezoelectric/electrostrictive device |
DE102010025659A1 (de) * | 2010-06-30 | 2012-01-05 | Siemens Aktiengesellschaft | Piezoelektrisches Bauteil mit bleifreiem, piezokeramischen Werkstoff auf Basis eines mit Silber dotierten Kalium-Natrium-Niobats und Verfahren zum Herstellen des Bauteils |
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US8124047B2 (en) | 2006-12-22 | 2012-02-28 | Ngk Insulators, Ltd. | Method for manufacturing (Li, Na, K)(Nb, Ta)O3 type piezoelectric material |
JP2008156210A (ja) * | 2006-12-22 | 2008-07-10 | Ngk Insulators Ltd | (Li,Na,K)(Nb,Ta)O3系圧電材料の製造方法 |
JP2009010367A (ja) * | 2007-05-30 | 2009-01-15 | Canon Inc | 圧電素子、圧電素子の製造方法、圧電アクチュエータおよびインクジェット式記録ヘッド |
JP2009102221A (ja) * | 2007-10-03 | 2009-05-14 | Ngk Insulators Ltd | 圧電/電歪磁器組成物及び圧電/電歪素子 |
JP2009114049A (ja) * | 2007-10-19 | 2009-05-28 | Ngk Insulators Ltd | 圧電/電歪磁器組成物及び圧電/電歪素子 |
JP2009206329A (ja) * | 2008-02-28 | 2009-09-10 | Seiko Epson Corp | 圧電素子およびその製造方法、圧電アクチュエータ、並びに、液体噴射ヘッド |
JP2010030809A (ja) * | 2008-07-28 | 2010-02-12 | Ngk Insulators Ltd | (Li,Na,K,Bi)(Nb,Ta)O3系圧電材料及びその製造方法 |
WO2012141104A1 (ja) * | 2011-04-14 | 2012-10-18 | 株式会社村田製作所 | 強誘電体薄膜およびその製造方法 |
WO2013094368A1 (ja) * | 2011-12-20 | 2013-06-27 | 太陽誘電株式会社 | 圧電デバイス及び圧電磁器組成物 |
CN103958439A (zh) * | 2011-12-20 | 2014-07-30 | 太阳诱电株式会社 | 压电器件和压电陶瓷组合物 |
US9406866B2 (en) | 2011-12-20 | 2016-08-02 | Taiyo Yuden Co., Ltd. | Piezoelectric device with piezoelectric ceramic layer having AG segregated in voids in sintered body of perovskite composition |
CN103958439B (zh) * | 2011-12-20 | 2016-10-26 | 太阳诱电株式会社 | 压电器件和压电陶瓷组合物 |
US9614142B2 (en) | 2011-12-20 | 2017-04-04 | Taiyo Yuden Co., Ltd. | Piezoelectric ceramic composition constituted by Ag-segregated sintered body of zirconate-titanate type perovskite composition |
US9755137B2 (en) | 2011-12-20 | 2017-09-05 | Taiyo Yuden Co., Ltd. | Piezoelectric device with piezoelectric ceramic layer constituted by alkali-containing niobate type perovskite composition |
JP2016139643A (ja) * | 2015-01-26 | 2016-08-04 | Tdk株式会社 | 圧電薄膜素子、圧電アクチュエータ、圧電センサ、並びにハードディスクドライブ、及びインクジェットプリンタ装置 |
Also Published As
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JPWO2006035723A1 (ja) | 2008-05-15 |
EP1796183A1 (en) | 2007-06-13 |
EP1796183A4 (en) | 2010-12-08 |
JP4927551B2 (ja) | 2012-05-09 |
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