WO2022124794A1 - 내부 전기장을 포함하는 압전 단결정, 그 제조방법 및 그를 이용한 압전 및 유전 응용 부품 - Google Patents
내부 전기장을 포함하는 압전 단결정, 그 제조방법 및 그를 이용한 압전 및 유전 응용 부품 Download PDFInfo
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/09—Forming piezoelectric or electrostrictive materials
- H10N30/093—Forming inorganic materials
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10N30/8548—Lead-based oxides
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/09—Forming piezoelectric or electrostrictive materials
- H10N30/093—Forming inorganic materials
- H10N30/097—Forming inorganic materials by sintering
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- 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
- H10N30/8561—Bismuth-based oxides
Definitions
- the present invention includes an internal electric field A piezoelectric single crystal, its manufacturing method, and piezoelectric and dielectric application parts using the same, and more particularly, in a perovskite-type crystal structure ([A][B]O 3 ) to improve the piezoelectric properties of a single crystal, [A] ]
- a perovskite-type crystal structure [A][B]O 3 ) to improve the piezoelectric properties of a single crystal, [A] ]
- the high dielectric constant and high piezoelectric constant inherent in the piezoelectric single crystal are maintained, and the high coercive field and piezoelectric single crystal
- a piezoelectric single crystal with a novel perovskite-type crystal structure that simultaneously satisfies the characteristics of an internal electric field (E I ⁇ 0.5 to 3.0 kV/cm) essential for electrical stability, a manufacturing method thereof, and piezoelectric and dielectric application parts using the same is about
- the piezoelectric single crystals of the perovskite crystal structure exhibit significantly higher dielectric constants (K 3 T ) and piezoelectric constants (d 33 and k 33 ) compared to conventional piezoelectric polycrystalline materials, It is used in high-performance parts such as piezoelectric actuators, ultrasonic transducers, piezoelectric sensors and dielectric capacitors, and its application is expected as a substrate material for various thin film devices.
- the piezoelectric single crystals with perovskite crystal structure developed so far include PMN-PT (Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 ), PZN-PT (Pb(Zn 1/3 Nb 2/) 3 )O 3 -PbTiO 3 ), PInN-PT (Pb(In 1/2 Nb 1/2 )O 3 -PbTiO 3 ), PYbN-PT (Pb(Yb 1/2 Nb 1/2 )O 3 -PbTiO 3 ), PSN-PT (Pb(Sc 1/2 Nb 1/2 )O 3 -PbTiO 3 ), PMN-PInN-PT, PMN-PYbN-PT and BiScO 3 -PbTiO 3 (BS-PT), etc. .
- These single crystals undergo a congruent melting behavior during melting, and have been typically manufactured by conventional single crystal growth methods, such as the flux method, the Bridgman method, and the like.
- the previously developed piezoelectric single crystals of PMN-PT and PZN-PT have the advantage of showing high dielectric and piezoelectric properties (K 3 T >4,000, d 33 >1,400 pC/N, k 33 >0.85) at room temperature, Defects such as low phase transition temperatures (TC and T RT ), low coercive field ( EC ) and brittleness significantly limit the utilization of piezoelectric single crystals.
- piezoelectric single crystals having a perovskite-type crystal structure are known to have the highest dielectric and piezoelectric properties in the region near the rhombohedral phase and tetragonal phase boundary, that is, near the morphotropic phase boundary (MPB) composition.
- MPB morphotropic phase boundary
- piezoelectric single crystals with a perovskite crystal structure generally show the best dielectric and piezoelectric properties when they are rhombohedral
- the application of rhombohedral piezoelectric single crystals is most active, but rhombohedral piezoelectric single crystals are rhombohedral and tetrahedral. Since it is stable only below the phase transition temperature (T RT ) of Therefore, when the T RT phase transition temperature is low, the operating temperature of the rhombohedral piezoelectric single crystal is lowered, and the manufacturing temperature and operating temperature of the piezoelectric single crystal application part are also limited to T RT or less.
- phase transition temperatures (TC and T RT ) and the coercive field (EC ) are low, the piezoelectric single crystals are easily depolated under machining, stress, heat generation and driving voltage and exhibit excellent dielectric and piezoelectric properties. will lose Therefore, piezoelectric single crystals with low phase transition temperatures (TC and T RT ) and coercive field ( EC ) are limited in single crystal application part manufacturing conditions, operating temperature conditions, and driving voltage conditions.
- T C ⁇ 150 °C, T RT ⁇ 80 °C and E C ⁇ 2.5 kV/cm are generally; for PZN-PT single crystals, T C ⁇ 170 °C, T RT ⁇ 100 °C and E C ⁇ 3.5 kV/cm.
- dielectric and piezoelectric application parts made of these piezoelectric single crystals have limited manufacturing conditions, operating temperature range, and operating voltage conditions, which has been an obstacle to the development and practical use of piezoelectric single crystal application parts.
- the Curie temperature ( TC ) Since the decrease is inevitable, it is difficult to simultaneously increase the Curie temperature (TC ) and the phase transition temperature (T RT ) of the rhombohedral and tetragonal phases.
- phase transition temperature simply does not increase in proportion to the composition, or the dielectric and piezoelectric properties are lowered. Because.
- Non-Patent Document 1 the Relaxor-PT-based single crystals presented in Non-Patent Document 1 are mainly manufactured by the flux method and Bridgman method, which are conventional single crystal growth methods using a melting process.
- flux method and Bridgman method which are conventional single crystal growth methods using a melting process.
- commercialization has not yet been successful due to the high cost and difficulty in mass production.
- piezoelectric single crystals show a higher piezoelectric constant (d 33 ⁇ 2,000 to 4,000 pC/N), but have a low coercive field (EC ⁇ 2 kV/cm) and are easily depolated, resulting in electrical stability. This is low, which limits its practical use. Accordingly, a method of increasing the coercive field of the piezoelectric single crystal has been proposed, but the increase in the coercive field is a problem that is accompanied by a decrease in the piezoelectric properties, and still has low effectiveness.
- the present inventors have tried to improve the conventional problems, and as a result, by appropriately increasing the coercive electric field and the internal electric field, the electrical stability of the piezoelectric single crystal and the high piezoelectric characteristics are maintained at the same time, and In the perovskite-type crystal structure ([A][B]O 3 ), by controlling the oxygen partial pressure during heat treatment during the manufacturing process and composition changes of [A] site ions, [B] site ions and [O] site ions, piezoelectric While maintaining the high dielectric constant and piezoelectric constant inherent in the single crystal, the present invention was completed by confirming the physical properties that simultaneously satisfy the high internal electric field (E I ) characteristics essential for the electrical stability of the piezoelectric single crystal.
- E I high internal electric field
- Patent Document 1 Korean Patent No. 0564092 (published on March 27, 2006)
- Patent Document 2 Korean Patent No. 0743614 (published on July 30, 2007)
- Non-Patent Document 1 IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 44, no. 5, 1997, pp. 1140-1147.
- Another object of the present invention is to provide a method for manufacturing the piezoelectric single crystal.
- Another object of the present invention is to apply it to a piezoelectric component or a dielectric component using the piezoelectric single crystal.
- Piezoelectric Charge Constant (d 33 ) is 1,400 pC/N or more
- An internal electric field (Internal Bias Electric Field, E I ) provides a piezoelectric single crystal of a perovskite-type structure ([A][B]O 3 ) including an internal electric field that satisfies physical properties of 0.5 kV/cm or more.
- the dielectric constant (Dielectric Constant) is 5,000 or more
- the piezoelectric single crystal of the perovskite-type structure ([A][B]O 3 ) of the present invention controls the composition of [A] site ions, [B] site ions and [O] site ions, thereby reducing the coercive and internal electric fields. to maintain electrical stability and high piezoelectric properties of the piezoelectric single crystal.
- the first embodiment of the piezoelectric single crystal of the perovskite structure ([A][B]O 3 ) of the present invention provides a piezoelectric single crystal having the composition formula of the following Chemical Formula 1.
- A is Pb or Ba
- B is at least one selected from the group consisting of Ba, Ca, Co, Fe, Ni, Sn and Sr,
- C is at least one selected from the group consisting of Co, Fe, Bi, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu,
- L is a single or mixed form selected from Zr or Hf
- M is at least one selected from the group consisting of Ce, Co, Fe, In, Mg, Mn, Ni, Sc, Yb and Zn,
- N is at least one selected from the group consisting of Nb, Sb, Ta and W,
- the second embodiment of the piezoelectric single crystal of the perovskite structure ([A][B]O 3 ) of the present invention provides a piezoelectric single crystal having the compositional formula of the following formula (2).
- A is Pb or Ba
- B is at least one selected from the group consisting of Ba, Ca, Co, Fe, Ni, Sn and Sr,
- C is at least one selected from the group consisting of Co, Fe, Bi, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu,
- L is a single or mixed form selected from Zr or Hf
- M is at least one selected from the group consisting of Ce, Co, Fe, In, Mg, Mn, Ni, Sc, Yb and Zn,
- N is at least one selected from the group consisting of Nb, Sb, Ta and W,
- A, B, C, M and N are the same as in Formula 1 or 2, and a, b, x and y are also the same. However, 0.01 ⁇ w ⁇ 0.20.
- the piezoelectric single crystal having the composition formula of Formula 1 or Formula 2 of the present invention is a composition satisfying 0.01 ⁇ a ⁇ 0.10 and 0.01 ⁇ b ⁇ 0.05, and more preferably a/b ⁇ 2 in the above formula.
- the porosity in the single crystal is 0.5 vol% or more.
- the piezoelectric single crystal having the composition formula of Chemical Formula 1 or Chemical Formula 2 of the present invention has a compositional gradient of 0.2 to 0.5 mol% inside the single crystal, giving uniformity characteristics.
- x and y are 10 mol% from the composition of the phase boundary (MPB) of the rhombohedral phase and the tetragonal phase, more preferably, the x and y are 5 from the composition of the phase boundary (MPB) of the rhombohedral phase and the tetragonal phase It falls within the range of mol%.
- the above piezoelectric single crystal provides a piezoelectric single crystal having a Curie temperature (Tc) of 180 °C or higher and a phase transition temperature between rhombohedral phase and tetragonal phase (T RT ) of 100 °C or higher at the same time. .
- the piezoelectric single crystal has a longitudinal electromechanical coupling coefficient (k 33 ) of 0.85 or more, and a coercive electric field (Ec) of 3.5 to 12 kV/cm is satisfied.
- the present invention provides a method for producing the piezoelectric single crystal
- step (b) heat-treating the polycrystal having a reduced number density of abnormal particles obtained in step (a) to grow abnormal particles, wherein the powder of the composition constituting the piezoelectric single crystal is heated to less than 800 to 900° C.
- a method for producing a piezoelectric single crystal in which a powder compact is obtained by calcining at a temperature, and a primary heat treatment process for sintering the powder compact and a secondary heat treatment process for single crystal growth are performed.
- the composition of [A] site ions and [B] site ions is controlled, and oxygen partial pressure during heat treatment in the manufacturing process
- E I internal electric field
- the present invention provides a piezoelectric body made of the piezoelectric single crystal having excellent properties or a piezoelectric body in which the piezoelectric single crystal and a polymer are composited.
- piezoelectric application parts and dielectric application parts examples include ultrasonic transducers, piezoelectric actuators, piezoelectric sensors, dielectric capacitors, electric field generating transducers (Electric Field Generating) Transducers) and electric field-can be applied to any one selected from the group consisting of vibration radiation transducers (Electric Field and Vibration Generating Transducers).
- the piezoelectric single crystal and piezoelectric single crystal application parts according to the present invention have excellent physical properties, as well as dielectric constant (K 3 T ) of 4,000 or more, piezoelectric constant (d 33 ) of 1,400 pC/N or more, and coercive field ( EC ) of 3.5 kV/cm or more It has the advantage of simultaneously having a high internal bias electric field (E I ⁇ 0.5 ⁇ 3.0 kV/cm) characteristic that is "essential for the electrical stability of a piezoelectric single crystal", enabling it to be used in a wide temperature range and operating voltage conditions.
- K 3 T dielectric constant
- d 33 piezoelectric constant
- EC coercive field
- piezoelectric single crystals using a solid-state single crystal growth method suitable for mass production of single crystals and develop a single crystal composition that does not include expensive raw materials, thereby enabling commercialization of piezoelectric single crystals.
- the piezoelectric single crystal and the piezoelectric single crystal application part according to the present invention can manufacture and use the piezoelectric application part and the dielectric application part using the piezoelectric single crystal with excellent characteristics in a wide temperature range.
- FIG. 5 is a polarization-electric field graph for a typical PMN-30PT piezoelectric single crystal [single crystal growth atmosphere (Air)] manufactured by a solid-state single crystal growth method,
- the present invention provides a piezoelectric single crystal that maintains high piezoelectric properties and electrical stability of the piezoelectric single crystal by increasing the coercive electric field and the internal electric field.
- dielectric constant (Dielectric Constant, K 3 T ) is 4,000 or more
- Piezoelectric Charge Constant (d 33 ) is 1,400 pC/N or more
- An internal electric field (Internal Bias Electric Field, E I ) provides a piezoelectric single crystal of a perovskite-type structure ([A][B]O 3 ) including an internal electric field that satisfies physical properties of 0.5 kV/cm or more.
- the dielectric constant (Dielectric Constant) is 5,000 or more
- the piezoelectric single crystal of the present invention has (1) a dielectric constant (K 3 T ) of 4,000 to 15,000, (2) a piezoelectric constant (d 33 ) of 1,400 to 6,000 pC/N,
- the internal electric field (Internal Bias Electric Field, E I ) is to satisfy 0.5 to 3.0 kV / cm.
- the piezoelectric single crystal of the present invention is characterized in that the physical properties of the above (1) to (4) are maintained at a temperature of 20 to 80 °C.
- the dielectric constant and the piezoelectric constant value may be evaluated under the same temperature condition at room temperature, and unless otherwise specified in the specification of the present invention, it means the dielectric constant and the piezoelectric constant value evaluated at 30°C.
- the piezoelectric single crystal of the perovskite-type structure controls the composition of [A] site ions, [B] site ions, and [O] site ions, thereby increasing the coercive field and internal electric field.
- the electrical stability and high piezoelectric properties of the piezoelectric single crystal are maintained.
- the present invention provides a piezoelectric single crystal having the composition formula of the following formula (1) of the perovskite structure ([A][B]O 3 ) of the first embodiment.
- A is Pb or Ba
- B is at least one selected from the group consisting of Ba, Ca, Co, Fe, Ni, Sn and Sr,
- C is at least one selected from the group consisting of Co, Fe, Bi, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu,
- L is a single or mixed form selected from Zr or Hf
- M is at least one selected from the group consisting of Ce, Co, Fe, In, Mg, Mn, Ni, Sc, Yb and Zn,
- N is at least one selected from the group consisting of Nb, Sb, Ta and W,
- the present invention provides a piezoelectric single crystal having the composition formula of the following formula (2) of the perovskite-type structure ([A][B]O 3 ) of the second embodiment.
- A is Pb or Ba
- B is at least one selected from the group consisting of Ba, Ca, Co, Fe, Ni, Sn and Sr,
- C is at least one selected from the group consisting of Co, Fe, Bi, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu,
- L is a single or mixed form selected from Zr or Hf
- M is at least one selected from the group consisting of Ce, Co, Fe, In, Mg, Mn, Ni, Sc, Yb and Zn,
- N is at least one selected from the group consisting of Nb, Sb, Ta and W,
- the piezoelectric single crystal having the composition formula of Formula 1 or Formula 2 of the present invention is based on the tendency of the piezoelectric properties to further increase as the chemical composition is compounded, in the perovskite-type crystal structure ([A][B]O 3 ), [A] Organize site ions into a complex composition.
- the complex composition of the [A] site ion in the piezoelectric single crystal having the composition formula of Chemical Formula 1 or Chemical Formula 2 may be composed of [A 1-(a+1.5b) B a C b ], wherein the composition A Silver contains lead or lead-free elements, and in the embodiment of the present invention, A is Pb, but will be described limited to the lead-based piezoelectric single crystal, but will not be limited thereto.
- the B composition is a metal divalent element, preferably at least one selected from the group consisting of Ba, Ca, Co, Fe, Ni, Sn and Sr, and the C composition is a metal trivalent element. If it is an element, use it.
- the lanthanide element is used as one type or a mixture of two types.
- the C composition in the [A] site ion, is described as a single or a mixed composition including La and Sm, but will not be limited thereto.
- the complex composition of the [A] site ion corresponding to the donor in the piezoelectric single crystal composition of Formula 1 0.01 ⁇ a ⁇ 0.10 and 0.01 ⁇ b ⁇ 0.05 must be satisfied, more preferably a/ b ⁇ 2 is satisfied.
- a is less than 0.01 in the above, there is a problem that the perovskite phase is unstable, and if it exceeds 0.10, the phase transition temperature is too low, which makes practical use difficult, which is not preferable.
- [A][MN]O 3 -PbTiO 3 -PbZrO 3 phase diagram shows a compositional region exhibiting excellent dielectric and piezoelectric properties around the rhombohedral phase and the tetragonal phase boundary (MPB).
- MB tetragonal phase boundary
- dielectric and piezoelectric properties are maximized at the rhombohedral and tetragonal phase boundary compositions, and the dielectric and piezoelectric properties gradually decrease as the composition moves away from the MPB composition.
- high dielectric and piezoelectric properties were maintained within the range of 5 mol% composition in the rhombohedral and tetragonal regions, respectively, and within the range of 10 mol% in the rhombohedral and tetragonal regions in the MPB composition, respectively. It exhibits sufficiently high dielectric and piezoelectric properties for applications in dielectric and piezoelectric applications.
- x preferably falls within the range of 0.05 ⁇ x ⁇ 0.58, and further Preferably, 0.10 ⁇ x ⁇ 0.58.
- x is less than 0.05, the phase transition temperatures (Tc and T RT ), piezoelectric constants (d 33 , k 33 ) or coercive field (Ec) are low, and when x exceeds 0.58, the dielectric constant (K 3 T ) , because the piezoelectric constants (d 33 , k 33 ) or the phase transition temperature (T RT ) are low.
- y preferably falls within the range of 0.05 ⁇ y ⁇ 0.62, and more preferably satisfies 0.10 ⁇ y ⁇ 0.62.
- Tc and T RT phase transition temperatures
- Ec coercive field
- the piezoelectric single crystal having the composition formula of Formula 1 or Formula 2 of the present invention includes a metal tetravalent element in the [B] site ion in the perovskite-type crystal structure ([A][B]O 3 ), in particular, the L composition With respect to, it is limited to a single or mixed form selected from Zr or Hf.
- a piezoelectric single crystal having a composition formula of the following Chemical Formula 3 or Chemical Formula 4 is provided.
- A, B, C, M and N are the same as in Formula 1 or Formula 2, and a, b, x and y are also the same, provided that 0.01 ⁇ w ⁇ 0.20.
- the Examples will be specifically described based on the piezoelectric single crystal having a perovskite structure having the composition formula of the following Chemical Formula 5.
- C is at least one selected from the group consisting of Co, Fe, Bi, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu,
- M is at least one selected from the group consisting of Ce, Co, Fe, In, Mg, Mn, Ni, Sc, Yb and Zn,
- N is at least one selected from the group consisting of Nb, Sb, Ta and W,
- composition of the piezoelectric single crystal having the composition of Chemical Formula 5 the coercive electric field and the internal electric field while maintaining the high dielectric constant, the piezoelectric constant and the coercive field inherent in the piezoelectric single crystal by limiting the donor and acceptor composition ratios
- the composition and composition ratio are not limited thereto, and various variations and modifications may be made within the composition range of Chemical Formula 1.
- 1 to 3 are photos of a piezoelectric single crystal of a perovskite-type structure prepared according to the first embodiment of the present invention.
- the single crystal appearance varies depending on the donor and acceptor composition ratio changes and the atmosphere during single crystal growth. can confirm.
- the composition of the piezoelectric single crystal of the first embodiment by optimizing and controlling the donor content and the acceptor, preferably the Mn content, The core electric field and the internal electric field are effectively increased to increase the stability of the piezoelectric single crystal during electric field driving and under mechanical load conditions.
- the piezoelectric single crystal of the second embodiment it is characterized in that the oxygen vacancy at the [O] site is controlled to 0 ⁇ z ⁇ 0.02.
- z exceeds 0.02, there is a problem in that dielectric and piezoelectric properties are rapidly lowered, which is not preferable.
- the piezoelectric single crystal having the composition formula of Formula 1 or Formula 2 above has a complex composition of [A] site ions and [B] site ions and [O] site in the perovskite crystal structure ([A][B]O 3 ).
- a complex composition of [A] site ions and [B] site ions and [O] site in the perovskite crystal structure [A][B]O 3 ).
- Tc Curie temperature
- T RT phase transition temperature between rhombohedral phase and tetragonal phase
- the piezoelectric single crystal having the composition formula of Formula 1 or Formula 2 according to the present invention has an electromechanical coupling coefficient (k 33 ) of 0.85 or more, and when the electromechanical coupling coefficient is less than 0.85, properties are similar to those of piezoelectric polycrystalline ceramics and energy This is undesirable because the conversion efficiency is lowered.
- the piezoelectric single crystal having the composition formula of Formula 1 or Formula 2 of the present invention may provide a uniform single crystal because the composition gradient inside the single crystal is 0.2 to 0.5 mol%.
- Lead zirconate not only has a high phase transition temperature of 230°C, but also has the effect of making the MPB more perpendicular to the temperature axis, maintaining a high Curie temperature while maintaining high rhombohedral and tetragonal phase transition temperatures (T RT ), allowing development of compositions with high Tc and T RT at the same time.
- the piezoelectric single crystal of the perovskite type crystal structure containing zirconium (Zr) or lead zirconate can overcome the problems of the conventional piezoelectric single crystals.
- zirconia (ZrO 2 ) or lead zirconate is used as a main component in an existing piezoelectric polycrystalline material and is an inexpensive raw material, the object of the present invention can be achieved without increasing the raw material price of a single crystal.
- the perovskite-type piezoelectric single crystal containing lead zirconate does not show a congruent melting behavior and exhibits an incongruent melting behavior, unlike PMN-PT and PZN-PT, when melting. Therefore, if the non-eutectic behavior is shown, the liquid phase and the solid phase ZrO 2 are separated when the solid phase is melted, and the solid zirconia particles in the liquid phase interfere with the single crystal growth and use the melting process, such as the flux method and the Bridgman method, which are general single crystal growth methods. cannot be manufactured with
- the present invention manufactures piezoelectric single crystals including a reinforced secondary phase by using a solid-phase single crystal growth method that does not use a melting process.
- a solid-phase single crystal growth method since single crystal growth occurs below the melting temperature, the chemical reaction between the reinforced secondary phase and the single crystal is suppressed, and the reinforced secondary phase can stably exist in an independent form inside the single crystal.
- single crystal growth occurs in a polycrystal including a reinforced secondary phase, and there is no change in volume fraction, size, shape, arrangement and distribution of the reinforced secondary phase during single crystal growth. Therefore, in the process of making a polycrystal including a reinforced secondary phase, if the volume fraction, size, shape, arrangement and distribution of the reinforced secondary phase inside the polycrystal are adjusted and the single crystal is grown, as a result, a single crystal including a reinforced secondary phase of a desired shape That is, second phase-reinforced single crystals can be manufactured.
- the complex composition of [A] site ions and the [B] site ion inter-ion By making the piezoelectric single crystal grow uniformly even with a complex composition, the dielectric constant (K 3 T ⁇ 4,000 to 15,000) and the piezoelectric constant (d 33 ⁇ 1,400 to 6,000 pC/N) and higher coercive field compared to conventional piezoelectric single crystals ( It is possible to provide a novel piezoelectric single crystal with significantly higher E C ⁇ 3.5 to 12 kV/cm).
- the coercive field ( EC ) is 3.5 kV/cm or more, more preferably 4 to 12 kV/cm, and the coercive field is less than 3.5 kV/cm, piezoelectric single crystal processing or piezoelectric single crystal application parts manufacturing or There is a problem in that polling is easily removed during use.
- E I Internal Bias Electric Field
- the present invention provides a method for manufacturing a piezoelectric single crystal according to a solid-phase single crystal growth method.
- the solid-phase single crystal growth method is based on Patent Documents 1 and 2, and the piezoelectric single crystal grown by the solid-phase single crystal growth method can be mass-produced at a lower process price than the flux method and the Bridgman method.
- the method for producing a piezoelectric single crystal of the present invention is
- step (b) heat-treating the polycrystal having a reduced number density of abnormal particles obtained in step (a) to grow abnormal particles, wherein the powder of the composition constituting the piezoelectric single crystal is heated to less than 800 to 900° C.
- a method for producing a piezoelectric single crystal in which a powder compact is obtained by calcining at a temperature, and a primary heat treatment process for sintering the powder compact and a secondary heat treatment process for single crystal growth are performed.
- a method for manufacturing a piezoelectric single crystal in which the polycrystal is heat-treated under conditions for reducing the number density of abnormal particles by controlling the average size of matrix particles of the polycrystal having the above composition.
- a single crystal can be obtained by continuously growing only a small number of abnormal particles generated in a state in which the number density of the abnormal particles of the polycrystal is reduced.
- the average size (R) of matrix particles of the polycrystal is 0.5 to 2 times the critical size at which abnormal particle generation occurs (average size of matrix particles at which the number density of abnormal particles becomes “0 (zero), R c )” It is controlled within the range (0.5R c ⁇ R ⁇ 2R c ). At this time, when the average size of matrix particles of the polycrystal is smaller than 0.5Rc (0.5Rc> R), the number density of abnormal particles is too high, so that single crystals cannot grow, and the average size of matrix particles of the polycrystal is less than 2Rc In a large case (2Rc ⁇ R), the number density of the abnormal grains is "0", but the growth rate of the single crystal is too slow to produce a large single crystal.
- the primary and secondary heat treatment steps are performed at 900 to 1,300° C. for 1 to 100 hours, and the heat treatment is preferably performed at a temperature increase rate of 1 to 20° C./min.
- the heat treatment may be performed by adjusting the oxygen partial pressure.
- the oxygen partial pressure control may be performed in an air condition, an N 2 atmosphere, or a H 2 -N 2 atmosphere, and as the oxygen partial pressure in the atmosphere decreases, the dielectric constant and the piezoelectric constant decrease continuously, but The physical properties of increasing electric field (EC ) and internal electric field ( E I ) are realized.
- a defect dipole is induced by the combination of an acceptor and an oxygen vacancy, thereby increasing the magnitude of the internal electric field.
- the oxygen vacancy content in the piezoelectric single crystal may be controlled by further performing a tertiary heat treatment on the grown single crystal.
- the tertiary heat treatment process may be performed at different temperatures and times depending on the oxygen atmosphere, but preferably at 600 to 1,300° C. for 0.1 to 100 hours.
- the piezoelectric single crystal of the second embodiment can be manufactured by adjusting the oxygen vacancy content (0 ⁇ z ⁇ 0.02) by the oxygen partial pressure condition in the atmosphere during the additional tertiary heat treatment process after the single crystal growth process. .
- the internal electric field (E I ) which is not found in the general PMN-PT single crystal, can be induced sufficiently large, thereby manufacturing a new piezoelectric single crystal with high resistance to the external environment. can do.
- the present invention provides a piezoelectric body in which the piezoelectric single crystal alone or a piezoelectric single crystal and a polymer are complexed.
- the polymer is not particularly limited, but as a representative example, when an epoxy resin is mixed, it may be provided in a form having high resistance to mechanical shock and easy machining.
- the present invention may provide a piezoelectric application part and a dielectric application part using the piezoelectric body
- the piezoelectric application parts include an ultrasonic transducer (a medical ultrasonic diagnostic device, a sonar transducer, a non-destructive test transducer, an ultrasonic cleaner, an ultrasonic wave motor, etc.), piezoelectric actuators ( d33 type actuator, d31 type actuator, d15 type actuator, piezoelectric actuator for fine position control, piezoelectric pump, piezoelectric valve and piezoelectric speaker, etc.), piezoelectric sensor (piezoelectric accelerometer, etc.), electric field radiation transformer Electric Field Generating Transducers and Electric Field and Vibration Generating Transducers.
- an ultrasonic transducer a medical ultrasonic diagnostic device, a sonar transducer, a non-destructive test transducer, an ultrasonic cleaner, an ultrasonic wave motor, etc.
- piezoelectric actuators d33 type actuator,
- dielectric application components include high-efficiency capacitors, infrared sensors, dielectric filters, and the like.
- MgO and Nb 2 O 5 powder were mixed by ball milling and calcined to prepare a MgNb 2 O 6 phase, and additionally, raw powders were mixed again in a quantitative ratio and calcined to prepare a perovskite powder.
- Mixed powders were prepared by adding excess PbO and MgO to the prepared powder. After molding the mixed powders, they were press-molded with a hydrostatic pressure of 200 MPa, and the powder compacts were heat-treated for up to 100 hours at 25° C. intervals under various temperature conditions between 900° C. and 1300° C., respectively.
- the average size (R) of matrix particles of the polycrystal is at least 0.5 times the critical size at which the generation of abnormal particles occurs (the average size of matrix particles at which the number density of abnormal particles becomes “0 (zero)”, R c ) 2 or more
- the size range (0.5R c ⁇ R ⁇ 2R c ) was adjusted to less than double, the seed single crystals grew continuously into the polycrystals.
- the average size (R) of matrix particles of the polycrystal could be adjusted to a size range of 0.5 times or more and 2 times or less of the critical size at which abnormal particles were generated.
- the Ba(Ti 0.7 Zr 0.3 )O 3 seed single crystal was [Pb 0.98-1.5x Sr 0.02 La x ][(Mg 1/3 Nb 2/3 ) 0.4-y (Mn 1/3 Nb 2/3 ) y Zr 0.25 Ti 0.35 ]O 3 (0.0 ⁇ x ⁇ 0.02; 0.0 ⁇ y ⁇ 0.1) polycrystalline interior
- a single crystal having the same composition as a polycrystal was prepared by continuously growing it. At this time, the size of the grown single crystal was 20 ⁇ 20 mm 2 or more.
- FIG. 2 shows black color due to the addition of Mn to the single crystal growth atmosphere Air.
- a piezoelectric single crystal can be manufactured while changing the oxygen partial pressure in the atmosphere during the primary sintering and single crystal growth heat treatment of the ceramic powder compact.
- Example 1 Evaluation of dielectric and piezoelectric properties of the piezoelectric single crystal of Example 1
- the prepared [Pb 0.98-1.5x Sr 0.02 La x ][(Mg 1/3 Nb 2/3 ) 0.4-y (Mn 1/3 Nb 2/3 ) y Zr 0.25 Ti 0.35 ]O 3 ( 0.0 ⁇ x ⁇ 0.02; 0.0 ⁇ y ⁇ 0.1)
- Dielectric constant according to change of x[Donor content] and y[Mn content] in single crystal, phase transition temperatures (TC and T RT ), piezoelectric constant, coercive field (E C ) and changes in the characteristics of the internal electric field (E I ) were measured by the IEEE method using an impedance analyzer, etc., respectively, and are shown in Table 1 below.
- the piezoelectric single crystal of the present invention when the values of x [Donor content] and y [Mn content] are above a certain value (x ⁇ 0.0 and y ⁇ 0.0), the dielectric constant and the piezoelectric constant are general It was possible to significantly increase the coercive field (EC ) and internal electric field ( E I ) while remaining similar to the PMN-PT single crystal. In particular, a new piezoelectric single crystal with high resistance to the external environment has been developed because it can induce a sufficiently large internal electric field (E I ), which is not present in general PMN-PT single crystals.
- E I internal electric field
- the dielectric constant and the piezoelectric constant continuously decreased as the magnitude of the oxygen partial pressure in the atmosphere during the primary sintering and single crystal growth heat treatment process decreased, but the coercive field (EC ) and the internal electric field ( E I ) ) increased.
- the present invention can induce a sufficiently large internal electric field (E I ), which is not present in a general PMN-PT single crystal, by controlling the atmosphere [the magnitude of the oxygen partial pressure] during the primary sintering and single crystal growth heat treatment process, A new piezoelectric single crystal with high resistance has been developed.
- piezoelectric single crystals containing an internal electric field (E I ) of a specific abnormal size (E I > 0.5 or 1.0 kV/cm) have high piezoelectric properties unlike the conventional PMN-PT or PIN-PMN-PT single crystals. showed a characteristic of being stable with respect to changes in
- Example 2 Evaluation of dielectric and piezoelectric properties of the piezoelectric single crystal of Example 2
- the dielectric constant and the piezoelectric constant continuously decreased as the magnitude of the partial pressure of oxygen in the atmosphere during the primary sintering and single crystal growth heat treatment process decreased, but the coercive field (EC ) and the internal electric field ( E I ) ) increased.
- the present invention can induce a sufficiently large internal electric field (E I ), which is not present in a typical PMN-PT single crystal, through the control of the atmosphere [the magnitude of the oxygen partial pressure] during the primary sintering and single crystal growth heat treatment process, so that it is resistant to the external environment
- E I internal electric field
- piezoelectric single crystals containing an internal electric field (E I ) of a specific abnormal size (E I > 0.5 or 1.0 kV/cm) have high piezoelectric properties unlike the conventional PMN-PT or PIN-PMN-PT single crystals. showed a characteristic of being stable with respect to changes in
- a piezoelectric single crystal and a general PMN-30PT piezoelectric single crystal were prepared by a solid-phase single crystal growth method, respectively.
- a measurement sample having a size of “(001) 4 ⁇ 4 ⁇ 0.5(T) mm” was prepared using the prepared piezoelectric single crystals, and the change of the coercive field (EC ) and the internal electric field ( E I ) according to the increase in temperature was measured. observed.
- Piezoelectric single crystal is a graph of changes in polarization with respect to the electric field, observing the changes in the coercive field and the internal electric field while increasing the temperature at room temperature.
- the coercive field (EC ) and the internal electric field (E I ) at 25° C were 4.4 and 1.0 kV/cm, respectively, and when the temperature was increased to 80°C, the coercive field and the internal electric field were 2.3 and 0.6 kV/cm, respectively. decreased.
- FIG. 5 is a graph of observing a change in polarization with respect to an electric field of a general PMN-30PT piezoelectric single crystal [single crystal growth atmosphere - Air] manufactured by a solid-state single crystal growth method. Changes in the electric field were observed.
- the coercive field at 25°C was 2.5 kV/cm and no internal electric field was observed. And when the temperature was increased to 80 °C, the coercive field was significantly reduced to 1.2 kV/cm.
- the coercive field and the internal electric field are maintained even when the temperature is increased, so that the characteristic is maintained without depoling to the temperature change.
- the coercive field of the piezoelectric single crystal [single crystal growth atmosphere - Air] was similar to that of the PMN-30PT piezoelectric single crystal [single crystal growth atmosphere - Air] at room temperature. It was confirmed to show stability.
- a piezoelectric single crystal was prepared by a solid-phase single crystal growth method. Measurement of the size of “(001) 4 ⁇ 4 ⁇ 0.5(T)mm” using piezoelectric single crystals manufactured by controlling oxygen partial pressure using N 2 -H 2 atmosphere during primary sintering and single crystal growth heat treatment in the manufacturing process A sample was prepared and the change of the coercive field (EC ) and the internal electric field ( E I ) was observed.
- MgO and Nb 2 O 5 powder were mixed by ball milling and calcined to prepare a MgNb 2 O 6 phase, and additionally, raw powders were mixed again in a quantitative ratio and calcined to prepare a perovskite powder (calcination process).
- Mixed powders were prepared by adding excess PbO and MgO to the prepared powder. After molding the mixed powders, they were press-molded with a hydrostatic pressure of 200 MPa, and the powder compacts were heat-treated at 25°C intervals at various temperature conditions between 900°C and 1300°C for up to 100 hours, respectively.
- Ba(Ti 0.7 Zr 0.3 )O 3 seed single crystal was placed on the polycrystal thus prepared and heat-treated (single crystal growth heat treatment, secondary heat treatment), and polycrystal composition using continuous growth of the seed single crystal into the polycrystal of A single crystal was prepared.
- the average size (R) of matrix particles of the polycrystal is at least 0.5 times the critical size at which the generation of abnormal particles occurs (the average size of matrix particles at which the number density of abnormal particles becomes “0 (zero)”, R c ) 2 or more
- the size range (0.5R c ⁇ R ⁇ 2R c ) was adjusted to less than double, the seed single crystals grew continuously into the polycrystals.
- the average size (R) of matrix particles of the polycrystal could be adjusted to a size range of 0.5 times or more and 2 times or less of the critical size at which abnormal particles were generated.
- piezoelectric single crystals having various “0 ⁇ z ⁇ 0.03 [oxygen vacancy content]” as shown in Tables 5 and 6 were prepared.
- piezoelectric single crystals having various “0 ⁇ z ⁇ 0.03 [oxygen vacancy content]” as shown in Tables 7 and 8 were prepared.
- Example 5 Evaluation of dielectric and piezoelectric properties of the piezoelectric single crystal of Example 3 1
- Example 3 [Pb 0.98-1.5x Sr 0.02 Sm x ][(Mg 1/3 Nb 2/3 ) 0.35 Zr 0.30 Ti 0.35 ]O 3-z (0.0 ⁇ x ⁇ 0.02; 0.0 ⁇ z ⁇ 0.03) The dielectric and piezoelectric properties of the piezoelectric single crystal were evaluated.
- the dielectric constant and piezoelectric constant are kept similar to those of a general PMN-PT single crystal while simultaneously maintaining the coercive field (E C ) and internal electric field (E I ) could be significantly increased.
- E C coercive field
- E I internal electric field
- the oxygen vacancy content (z) which is not found in the general PMN-PT single crystal, can be induced sufficiently large, and thus a new piezoelectric single crystal with high resistance to the external environment can be developed.
- the piezoelectric single crystals containing oxygen vacancy content in a specific range (0 ⁇ z ⁇ 0.03) have high piezoelectric properties that are stably maintained against changes in the external environment. characteristics were shown.
- Example 7 Evaluation of dielectric and piezoelectric properties of the piezoelectric single crystal of Example 4 1
- Example 4 prepared in Example 4, [Pb 0.98-1.5x Sr 0.02 La x ][(Mg 1/3 Nb 2/3 ) 0.35 (Mn 1/3 Nb 2/3 ) 0.05 Zr 0.25 Ti 0.35 ]O 3- The dielectric and piezoelectric properties of the z (0.0 ⁇ x ⁇ 0.02; 0.0 ⁇ z ⁇ 0.03) piezoelectric single crystal were evaluated.
- the dielectric constant and piezoelectric constant are kept similar to those of a general PMN-PT single crystal while simultaneously maintaining the coercive field (E C ) and internal electric field (E I ) could be significantly increased.
- E C coercive field
- E I internal electric field
- the dielectric constant, the piezoelectric constant, and the change in the characteristics of the coercive field (EC ) and the internal electric field ( E I ) of the piezoelectric single crystals were measured by the IEEE method using an impedance analyzer, etc., and are shown in Table 8 below.
- the oxygen vacancy content (z) which is not found in the general PMN-PT single crystal, can be induced to be sufficiently large, and a new piezoelectric single crystal with high resistance to the external environment can be developed.
- the piezoelectric single crystals containing oxygen vacancy content in a specific range (0 ⁇ z ⁇ 0.02) have high piezoelectric properties that are stably maintained against changes in the external environment. characteristics were shown.
- the piezoelectric single crystal was The coercive and internal electric fields were relatively high at 4.4 and 1.0 kV/cm, respectively.
- the coercive field and the internal electric field were greatly increased to 5.6 and 3.4 kV/cm, respectively. From these results, it was shown that the coercive field and the internal electric field increased in proportion to the oxygen vacancy content inside the piezoelectric single crystal.
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Abstract
Description
Claims (25)
- 하기 (1) 내지 (4)의 물성을 충족하는 내부 전기장을 포함한 페로브스카이트형 구조([A][B]O3)의 압전 단결정:(1) 유전 상수(Dielectric Constant, K3 T)가 4,000 내지 15,000,(2) 압전 상수(Piezoelectric Charge Constant, d33)가 1,400 내지 6,000 pC/N,(3) 항전계 (Coercive Electric Field, EC)가 3.5 내지 12 kV/㎝ 및(4) 내부 전기장 (Internal Bias Electric Field, EI)가 0.5 내지 3.0 kV/㎝.
- 제1항에 있어서, 상기 물성이 20 내지 80℃ 온도에서 유지되는 것을 특징으로 하는 압전 단결정.
- 제1항에 있어서, 상기 페로브스카이트형 구조의 압전 단결정이 하기 화학식 1의 조성식을 가지는 것을 특징으로 하는 압전 단결정:화학식 1[A1-(a+1.5b)BaCb][(MN)1-x-y(L)yTix]O3상기 식에서,A는 Pb 또는 Ba이고,B는 Ba, Ca, Co, Fe, Ni, Sn 및 Sr으로 이루어진 군에서 선택된 적어도 1종 이상이며,C는 Co, Fe, Bi, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb 및 Lu로 이루어진 군에서 선택된 1종 이상이며,L은 Zr 또는 Hf에서 선택된 단독 또는 혼합 형태이고,M은 Ce, Co, Fe, In, Mg, Mn, Ni, Sc, Yb 및 Zn로 이루어지는 군에서 선택된 적어도 한 종 이상이며,N은 Nb, Sb, Ta 및 W로 이루어지는 군에서 선택된 적어도 한 종 이상이며,0<a≤0.10, 0<b≤0.05, 0.05≤x≤0.58 및 0.05≤y≤0.62이다.
- 하기 화학식 2의 조성식을 가지는 페로브스카이트형 구조의 압전 단결정:화학식 2[A1-(a+1.5b)BaCb][(MN)1-x-y(L)yTix]O3-z상기 식에서,A는 Pb 또는 Ba이고,B는 Ba, Ca, Co, Fe, Ni, Sn 및 Sr으로 이루어진 군에서 선택된 적어도 1종 이상이며,C는 Co, Fe, Bi, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb 및 Lu로 이루어진 군에서 선택된 1종 이상이며,L은 Zr 또는 Hf에서 선택된 단독 또는 혼합 형태이고,M은 Ce, Co, Fe, In, Mg, Mn, Ni, Sc, Yb 및 Zn로 이루어지는 군에서 선택된 적어도 한 종 이상이며,N은 Nb, Sb, Ta 및 W로 이루어지는 군에서 선택된 적어도 한 종 이상이며,0<a≤0.10, 0<b≤0.05, 0.05≤x≤0.58, 0.05≤y≤0.62 및 0<z≤0.02이다.
- 제3항 또는 제4항에 있어서, 상기 압전 단결정에서 L이 혼합 형태일 때, 화학식 3 또는 화학식 4의 조성식을 가지는 것을 특징으로 하는 압전 단결정:화학식 3[A1-(a+1.5b)BaCb][(MN)1-x-y(Zr1-w, Hfw)yTix]O3화학식 4[A1-(a+1.5b)BaCb][(MN)1-x-y(Zr1-w,Hfw)yTix]O3-z상기에서, A, B, C, M 및 N, a, b, x, y 및 z은 화학식 1 또는 화학식 2와 동일하며, 다만 0.01≤w≤0.20이다.
- 제3항 또는 제4항에 있어서, 상기 식에서0.01≤a≤0.10,0.01≤b≤0.05인 것을 특징으로 하는 압전 단결정.
- 제3항 또는 제4항에 있어서, 상기 식에서a/b≥2인 것을 특징으로 하는 압전 단결정.
- 제3항 또는 제4항에 있어서, 상기 식에서0.10≤x≤0.58 및 0.10≤y≤0.62인 것을 특징으로 하는 압전 단결정.
- 제3항 또는 제4항에 있어서, 상기 단결정 내의 기공률(Porosity)가 0.5 vol% 이상인 것을 특징으로 하는 압전 단결정.
- 제3항 또는 제4항에 있어서, 상기 압전 단결정이 단결정 내부의 조성 구배가 0.2 내지 0.5몰%로 이루어진 것을 특징으로 하는 압전 단결정.
- 제3항 또는 제4항에 있어서, 상기 x와 y는 능면체상과 정방정상의 상경계(MPB) 조성으로부터 10 mol% 이내의 범위에 속하는 것을 특징으로 하는 압전 단결정.
- 제3항 또는 제4항에 있어서, 상기 x와 y는 능면체상과 정방정상의 상경계(MPB) 조성으로부터 5 mol% 이내의 범위에 속하는 것을 특징으로 하는 압전 단결정.
- 제3항 또는 제4항에 있어서, 상기 압전 단결정이 큐리온도(Curie temperature, Tc)가 180℃ 이상이며 동시에 능면체상과 정방정상의 상전이온도(phase transition temperature between rhombohedral phase and tetragonal phase, TRT)가 100℃ 이상인 것을 특징으로 하는 압전 단결정.
- 제3항 또는 제4항에 있어서, 상기 압전 단결정이 전기기계결합계수(longitudinal electromechanical coupling coefficient, k33)가 0.85 이상인 것을 특징으로 하는 압전 단결정.
- (a) 제3항 또는 제4항에 따른 압전 단결정을 구성하는 조성을 가지는 다결정체의 기지상 입자들(matrix grains)의 평균 크기를 조절하여 비정상 입자의 개수 밀도(number density: number of abnormal grains/unit area)를 감소시키는 단계 및(b) 상기 단계(a)를 통해 얻어진 비정상 입자의 개수 밀도가 감소된 다결정체를 열처리하여 비정상 입자를 성장시키는 단계를 포함하되,상기 압전 단결정을 구성하는 조성의 분말을 800 내지 900℃ 미만의 온도에서 하소하여 분말 성형체를 수득하고, 상기 분말 성형체를 소결하는 1차 열처리공정 및 상기 단결정 성장 시 2차 열처리공정을 수행하는 압전 단결정의 제조방법.
- 제15항에 있어서, 상기 1차 및 2차 열처리공정이 900 내지 1,300℃에서 1 내지 100 시간동안 수행된 것을 특징으로 하는 압전 단결정의 제조방법.
- 제16항에 있어서, 상기 열처리가 1 내지 20℃/분 승온속도로 수행된 것을 특징으로 하는 압전 단결정의 제조방법.
- 제17항에 있어서, 상기 열처리 중 산소 분압 조건에 따라 항전계(EC) 및 내부 전기장(EI) 물성을 제어하는 것을 특징으로 하는 압전 단결정의 제조방법.
- 제18항에 있어서, 상기 산소 분압 감소 조건에 따라 항전계(EC) 및 내부 전기장(EI) 물성이 증가되는 물성이 구현된 것을 특징으로 하는 압전 단결정의 제조방법.
- 제15항에 있어서, 상기 단결정 성장완료 후 3차 열처리공정을 더 수행한 것을 특징으로 하는 압전 단결정의 제조방법.
- 제20항에 있어서, 상기 3차 열처리공정이 600 내지 1,300℃에서 0.1 내지 100 시간동안 수행된 것을 특징으로 하는 압전 단결정의 제조방법.
- 제20항에 있어서, 상기 3차 열처리공정 중 산소 분압 조건에 의해 산소 공공함량(0<z≤0.02)이 조절된 것을 특징으로 하는 압전 단결정의 제조방법.
- 제1항 내지 제14항 중 어느 한 항에 따른 압전 단결정 단독 또는 상기 압전 단결정과 폴리머가 복합화된 것을 특징으로 하는 압전체.
- 제23항의 압전체를 이용한 압전 응용 부품 및 유전 응용 부품.
- 제24항에 있어서, 상기 압전 응용 부품 및 유전 응용 부품이 초음파 트랜스듀서 (ultrasonic transducers), 압전 액추에이터 (piezoelectric actuators), 압전 센서 (piezoelectric sensors), 유전 캐패시터 (dielectric capacitors), 전기장 방사 트랜스듀서 (Electric Field Generating Transducers) 및 전기장-진동 방사 트랜스듀서 (Electric Field and Vibration Generating Transducers)로 이루어진 군에서 선택된 어느 하나인 것을 특징으로 하는 압전 응용 부품 및 유전 응용 부품.
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US17/928,608 US20230329120A1 (en) | 2020-12-11 | 2021-12-08 | Piezoelectric single crystal including internal electric field, method for manufacturing same, and piezoelectric and dielectric application components using same |
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KR100743614B1 (ko) * | 2005-11-04 | 2007-07-30 | 주식회사 세라콤 | 압전 단결정 및 그 제조방법, 그리고 그 압전 단결정을이용한 압전 및 유전 응용 부품 |
US20090212667A1 (en) * | 2004-05-06 | 2009-08-27 | Jfe Mineral Company, Ltd | Piezoelectric single crystal device and fabrication method thereof |
KR20130132988A (ko) * | 2011-02-28 | 2013-12-05 | 캐논 가부시끼가이샤 | 압전 재료, 압전 소자, 액체 토출 헤드, 초음파 모터, 및 먼지 제거 디바이스 |
US20150372219A1 (en) * | 2013-03-25 | 2015-12-24 | Kabushiki Kaisha Toshiba | Piezoelectric transducer, ultrasonic probe, and piezoelectric transducer manufacturing method |
KR101779899B1 (ko) * | 2016-11-03 | 2017-09-19 | 국방과학연구소 | 압전 단결정을 구비하는 적층형 압전 액추에이터 |
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US20090212667A1 (en) * | 2004-05-06 | 2009-08-27 | Jfe Mineral Company, Ltd | Piezoelectric single crystal device and fabrication method thereof |
KR100743614B1 (ko) * | 2005-11-04 | 2007-07-30 | 주식회사 세라콤 | 압전 단결정 및 그 제조방법, 그리고 그 압전 단결정을이용한 압전 및 유전 응용 부품 |
KR20130132988A (ko) * | 2011-02-28 | 2013-12-05 | 캐논 가부시끼가이샤 | 압전 재료, 압전 소자, 액체 토출 헤드, 초음파 모터, 및 먼지 제거 디바이스 |
US20150372219A1 (en) * | 2013-03-25 | 2015-12-24 | Kabushiki Kaisha Toshiba | Piezoelectric transducer, ultrasonic probe, and piezoelectric transducer manufacturing method |
KR101779899B1 (ko) * | 2016-11-03 | 2017-09-19 | 국방과학연구소 | 압전 단결정을 구비하는 적층형 압전 액추에이터 |
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