JP2002193663A - Sintered body of crystal-oriented perovskite compound, its manufacturing method, compact of ceramic powder used for the compound and plate-like crystal-oriented perovskite compound - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sintered body composition of a crystal-oriented perovskite compound, that is, a particle-oriented growth structure of a lead-free piezoelectric ceramic material by using a method for which the RTGG method is improved further. SOLUTION: The sintered body of the lead-free crystal-oriented perovskite compound, of which general formula is denoted as ABO3, is obtained. As the ABO3, BaTiO3 excels in piezoelectric performance. The crystal-oriented perovskite compound is syhthesized by reacting with the main component of ceramic during calcination by using an oriented plate-like particle template resin and in BaTiO3, Ba6Ti17O40 is used as the template resin and BaCo3 and BaTIO3 are used as the other mixed powder. The objective compound is obtained by firstly mixing these powders, in the next process, obtaining a sheet in which the template resin is oriented by e.g. the tape casting, obtaining a thermocompression-bonded bulk sheet by laminating a plurality of cutting sheets and generating an orientation growth reaction by baking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sintered body of a crystal-oriented perovskite compound, a method for producing the sintered body, a molded body of a ceramic powder used for the compound, and a plate-shaped crystal-oriented perovskite compound. More specifically, the present invention relates to a non-lead-based crystal-oriented perovskite compound having good piezoelectric characteristics applicable to actuators and sensors.

[0002]

2. Description of the Related Art Conventionally, perovskite-type composite oxides having an ABO ₃ crystal structure have been used as electronic components such as piezoelectric buzzers, piezoelectric sensors, and piezoelectric actuators. For these materials, a composition containing all lead, that is, lead titanate or lead zirconate titanate (PZT) is used as a composition having excellent piezoelectric performance.

In recent years, the use of electronic components using lead and its compounds as environmentally regulated substances has been restricted, and lead-free materials have been vigorously developed. PZ mentioned above
In order to replace T with another material, it is necessary to find a lead-free piezoelectric material having a piezoelectric performance equal to or better than that of PZT.

Conventionally, as a material for improving the piezoelectric performance,
A grain-oriented fired product of a single crystal material or a ceramic material aligned with a piezoelectric performance axis has been proposed. However, the above-mentioned single crystal material requires an enormous cost for its production, and there is a problem that it is not profitable in terms of cost, so that it cannot be used as an immediate alternative.

On the other hand, the perovskite-type composite oxide materials include, in a broad sense, a bismuth layered structure ferroelectric material and a tungsten bronze type ferroelectric material. In recent years, it has become possible to produce these materials as particle-oriented fired products by improving manufacturing techniques. For example, JP-A-2000-
Japanese Patent No. 34194 discloses reactive template grain growth (Re) in which a bismuth layered structure ferroelectric material is reacted from seed particles.
active Templated Grain Growth (RTGG) method is described.

In the above-mentioned RTGG method, template particles are oriented and arranged, and the template particles are reacted with a main component of ceramics during firing of ceramics. Plate-like particles are used for orientation of the template particles. Will be

In order to exhibit high piezoelectric performance, a crystal having a simple crystal structure is required in principle. However, the bismuth layered structure ferroelectric and the tungsten bronze type ferroelectric described above are complicated due to their complicated structures. There is a principle restriction that only low piezoelectric performance can be obtained. Therefore, even if these materials are crystallographically oriented, Jpn. J. Appl. Phys. Vol. 38 5553 (1999)
As shown in the above, characteristics exceeding PZT cannot be obtained. Here, it is only shown that the RTGG method can be performed with a tungsten bronze type ferroelectric material, and no actual product has been obtained.

Accordingly, a composition having an ABO ₃ crystal structure is most excellent, and this structure requires particle orientation in a composition containing no lead (which may contain a trace amount of lead as an additive). Barium titanate material is a material that can satisfy this requirement. Jpn. J. Appl. Phys. Part1,
Vol. 38, 5505-5511 (1999) evaluates a barium titanate single crystal material and shows that its properties are superior to PZT. Further, it is shown that the theoretical prediction and the experiment corresponded in the calculation of the cutout orientation and the piezoelectric performance corresponding to the polarization axis by using a polarized ceramic material. Therefore, by selecting a barium titanate-based material as the lead-free piezoelectric ceramic and performing the particle orientation by the RTGG method, it is possible to exhibit excellent piezoelectric performance.

[0009] However, such an attempt has been difficult for the following reasons. That is, a necessary condition for the RTGG is the orientation formation of the template particles, and for that purpose, plate-like particles are required. This is because the plate-like particles are easily oriented with respect to the sheet surface in a conventional sheet forming method such as tape casting. As a quantitative description of the plate-like particles at that time, the ratio of the thickness to the particle width,
That is, those having an aspect ratio of 10 or more are preferable. However, the biggest problem with barium titanate is that no plate-like particles having such appropriate physical properties exist.

J. Am. Ceram. Soc., Vol. 81, 1317-1321
(1998) reported a plate-like particle of a ceramic material Ba ₆ Ti ₁₇ O ₄₀ composed of a metal oxide of barium and titanium. However, these particles cannot satisfy the optimum aspect ratio in ABO ₃ .

[0011]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been achieved by using a method of further improving the RTGG method, which is a crystal which is a grain oriented growth structure of a lead-free piezoelectric ceramic material. An object of the present invention is to obtain a sintered body composition of an oriented perovskite compound and to provide a method for producing the same.

[0012]

According to a first aspect of the present invention, there is provided a sintered body of a crystal-oriented perovskite type compound comprising a double oxide represented by the general formula ABO ₃ , wherein A is a divalent metal element. Wherein B is a tetravalent metal element, and is a sintered body of a crystal oriented perovskite compound.

According to a second aspect of the present invention, there is provided a sintered body of a crystal oriented perovskite compound according to the first aspect, wherein the average degree of orientation according to the Lotgering method is 30% or more.

According to a third aspect of the present invention, there is provided a sintered body of a crystal oriented perovskite compound according to the second aspect, wherein a relative density value of the sintered body with respect to a theoretical density is 90% or more. .

According to a fourth aspect of the present invention, there is provided a sintered body of a crystal oriented perovskite compound, wherein at least 95% of the volume of the sintered body is made of a perovskite compound.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the ABO ₃ is a crystallized barium titanate in which the metal element of A is barium and the metal element of B is titanium. It is a sintered body of a characteristic crystal oriented perovskite compound.

According to a sixth aspect of the present invention, in the first aspect of the invention, the ABO ₃ comprises a crystallized barium titanate in which the metal element of A is barium and the metal element of B is titanium; A crystal orientation comprising a barium titanate-based compound containing one or more compounds in which the metal element is made of strontium, calcium, or lead, and wherein the metal element B is titanium. It is a sintered body of a perovskite compound.

The invention according to claim 7 provides a composite oxide plate-like powder containing an element A and an element B, a compound containing the element A,
A first step of mixing a compound powder containing the element B and one or more compound powders among compounds containing both the elements A and B, and using the mixed powder mixed in the first step. A second step of forming a ceramic green in which the plate-like powder is oriented, and a third step of synthesizing a crystal-oriented perovskite-type compound sintered body using ABO ₃ by performing a heat treatment on the ceramic green. A method for producing a sintered body of a crystal-oriented perovskite-type compound, characterized in that:

The invention according to claim 8 is the invention according to claim 7.
And the plate-like powder is Ba₆Ti₁₇O_{Four 0}And the first
BaCO as the compound powder to be mixed in the step_ThreeAnd Ba
TiO _ThreeABO obtained in the sintering step using powder_ThreeBut
Characterized by being a crystal oriented barium titanate sintered body
Of sintered body of crystalline oriented perovskite type compound
It is.

A ninth aspect of the present invention is the method for producing a sintered body of a crystal oriented perovskite type compound according to the seventh aspect of the present invention, wherein the relative density of the ceramic green is 60% or more.

A tenth aspect of the present invention provides a composite oxide plate-like powder comprising an element A and an element B, a compound containing the element A,
A crystal orientation perovskite type formed by a material containing at least one compound powder of the compound containing the element B and the compound containing both the elements A and B and a sintering aid. It is a sintered body composition of a compound.

An eleventh aspect of the present invention is the sintering aid according to the tenth aspect of the present invention, wherein the sintering aid is a lead germanate compound.

According to a twelfth aspect of the present invention, there is provided a powder of at least one compound selected from the group consisting of a compound containing the element A, a compound containing the element B, and a compound containing both the elements A and B; A first liquid obtained by dispersing a ceramic powder obtained by mixing a plate-like powder of a composite oxide comprising B in a non-polar solvent is disposed on a polar solvent as a second liquid, The ceramic powder is settled on an interface between a liquid and the second liquid, and the sedimented ceramic powder is dried to form a sheet-shaped molded product, which is used for a crystallographically oriented perovskite compound. It is a molded body of ceramic powder.

According to a thirteenth aspect of the present invention, there is provided a powder containing at least one compound selected from a compound containing the element A, a compound containing the element B, and a compound containing both the elements A and B;
And a plate-like powder of a composite oxide comprising the element B are formed into an aerosol, and the aerosol is sprayed on a supporting substrate simultaneously with a carrier gas, thereby forming the ceramic powder with a deposit. It is a molded body of ceramic powder used for a crystallographically oriented perovskite compound characterized by obtaining a body.

A fourteenth aspect of the present invention relates to a powder of a compound containing the element A, a compound containing the element B, and at least one compound selected from the compounds containing both the elements A and B,
And a first ceramic powder obtained by mixing a plate-like powder of a composite oxide composed of the element B, a compound containing the element A, a compound containing the element B, and both the elements A and B. And a second ceramic powder obtained by mixing powders of one or more compounds among the compound-containing compounds is aerosolized, and the aerosols are alternately or mixed at a fixed ratio, and simultaneously with the carrier gas, the support substrate is formed. A ceramic powder compact used for a crystallographically oriented perovskite-type compound, characterized in that a compact formed by depositing a ceramic powder is obtained by spraying the powder on a ceramic powder.

According to a fifteenth aspect of the present invention, there is provided a method of sintering a crystal-oriented perovskite compound, comprising laminating a plurality of the ceramic powder compacts according to the twelfth aspect and subjecting the laminated body to heat treatment. Body.

The invention of claim 16 is the invention of claim 13 or 1
4. A sintered body of a crystal oriented perovskite compound, characterized by being synthesized by performing a heat treatment on a ceramic powder compact of No. 4.

The invention of claim 17 is the invention of claim 15 or 1
6 is a plate-shaped crystal-oriented perovskite compound, which is obtained by cutting out a sintered body of the crystal-oriented perovskite compound according to the crystal orientation.

[0029]

DETAILED DESCRIPTION OF THE INVENTION The perovskite structure has the general formula A
A type of crystal structure found in the double oxide represented by BO ₃ , which belongs to a cubic system in an ideal type and contains one chemical unit (ABO ₃ ) in a unit cell. BaTiO _{3 according} to the present invention exhibits the above-mentioned ideal type at a high temperature. FIG. 1 is a diagram showing a unit cell having a perovskite structure. A white sphere represents an atom of A, a black sphere represents O, and a hatched sphere represents B atom.

In order to obtain a sintered body of a crystal oriented perovskite compound, plate-like particles are used as template particles (seed particles). Other particles that become perovskite-type compounds by reacting with the template particles are mixed with the template particles, and sheet formation of the mixed powder is performed by well-known tape casting or extrusion molding. At this time, if the aspect ratio of the plate-like particles is 8 or more, the orientation of the template particles with respect to the sheet surface can be easily achieved.

In order to make the piezoelectric performance superior to ordinary non-oriented perovskite compounds, the average degree of orientation is preferably 30% or more. The definition of the orientation degree according to the present invention is a well-known Lot geri (Lot geri).
ng) Follow the method. The degree of crystal orientation F (HKL) of the crystallographically-oriented ceramic obtained by the Lotgering method is defined by the following equation (1).

[0032]

(Equation 1)

In the above formula (1), I (HKL) is the X-ray diffraction intensity from the crystal plane (HKL) of the crystallographically-oriented ceramic. On the other hand, I _o (HKL) is the diffraction intensity from the crystal plane (HKL) of a non-oriented polycrystalline ceramic which is the same compound as the oriented ceramics. Σ ′ (HKL) is the sum of the X-ray diffraction intensities from the respective crystal planes of the crystallographically-oriented ceramic such as I (111), I (222), etc. in a tetragonal system.

On the other hand, ΔI _o (hkl) is the sum of X-ray diffraction intensities from all crystal planes (hkl) in the non-oriented polycrystalline ceramic. The value of F (HKL) is standardized to be 0% in the case of no orientation and 100% in the case where all crystallites are oriented. Further, the relative density of the crystallographically oriented sintered body is desirably 90% or more. Further, it is desirable that the proportion of the crystal phase other than ABO ₃ due to the remaining template particles is 5% or less.

A preferred lead-free piezoelectric ceramic composition of the present invention is barium titanate. A barium titanate in which barium atoms are replaced with metal elements such as strontium and calcium, or a trace amount of lead element is used. A barium titanate derivative-based composition may be included.

FIG. 2 is a diagram for explaining an example of a manufacturing process of a crystal oriented perovskite type sintered body according to the present invention.
Template particles (composite oxide 1 containing A and B in target ABO ₃ ) and a compound group (A, B, or A) containing a metal finally corresponding to the target composition
And a powder (compound 2) containing B and a compound (B), and a sheet-like ceramic green is formed by the powder mixture obtained in the step (S1), and a template in the powder mixture is formed. Step of Orienting Particles (S
2) and a step (S4) of finally obtaining a target crystal oriented sintered body by heat treatment by sintering to cause an orientation growth reaction.

As will be shown in the examples below, in a system using barium titanate, Ba ₆ Ti ₁₇ O ₄₀ is used as template particles, and BaC is used as another mixed powder.
O ₃ and BaTiO ₃ powder are preferably used. At this time, since barium carbonate (BaCO ₃ ) shows a reaction of decomposing into barium oxide and carbon dioxide at 800 ° C. or more, it is preferable to perform a calcination treatment (S4) in order to homogenize the powder mixture. .

Further, when the crystal structure is a tetragonal crystal such as barium titanate and the (111) orientation is used for the oriented crystal compact, the distortion with respect to the electric field does not involve hysteresis, which is more preferable.

In the solid state reaction by heat treatment of the above three kinds of substances, the powder filling rate in the state of containing the ceramic green, that is, the organic substance formed into a sheet before the calcination is important. Here, it is desirable that the bulk density when the ceramic green is debindered is measured and the powder is filled so that the value becomes 60% or more as a relative value to the ceramic density after the main firing.

In the mixing step (S1),
It is also effective to add a sintering aid (reaction aid) 3 to the powder mixture to promote the above-described solid phase reaction. Such sintering aids 3 include Li, Bi, B, Si, Pb,
There is an oxide such as Ge, and it is particularly desirable to add lead germanium oxide at a ratio of 2 wt% or less.

The sheet-like ceramic green can be formed by a sheet casting method (S21). Further, in order to improve the filling rate of the ceramic green, an interface sedimentation method (S22) may be used. Alternatively, an aerosol deposition method (S23) may be used in which the powder mixture is aerosolized and sprayed onto a support plate together with a carrier gas to deposit the powder mixture to obtain a film-like deposit. Further, a ceramic green may be used for the support base.

Then, a plurality of the obtained sheet-like ceramic greens are laminated (S3), and after sintering after obtaining a sufficient thickness in the thickness direction, a crystal-oriented bulk sintered body is obtained. Obtained (S4). By cutting out a plate corresponding to the orientation from the sintered body (S5),
Crystal-oriented substrates corresponding to all directions can be obtained.

(Example) An example using a barium (111) oriented sintered body as a crystal oriented perovskite type compound will be described. Ba ₆ Ti ₁₇ O _{4 0} as a template particles was obtained as follows. That is, B
aTiO ₃ and TiO ₂ were collected at a molar ratio of 6:11, mixed with a ball mill using the same weight of NaCl as a flux, and reacted at 1150 ° C. for 1 hour to form a plate-like Ba ₆ T.
i ₁₇ O ₄₀ was obtained. The particles have a width of 30 μm and a thickness of 3 μm
(Aspect ratio 10).

Next, the Ba ₆ Ti ₁₇ O ₄₀ , BaTiO ₃ ,
And BaCO ₃ were weighed and mixed at a molar ratio of 1:17:11, dispersed in a mixed organic solvent of toluene and ethanol, and then dispersed well using polyvinyl butyral as a binder resin and dibutyl phthalate as a plasticizer. A green sheet was obtained later by tape casting.

Then, the obtained green sheet was cut, a number of sheets corresponding to a desired thickness were stacked, and thermocompression-bonded to form a bulk green, and after a binder removal treatment, a calcination treatment was performed. The calcination temperature was BaTiO ₃
A temperature of 800 ° C. or higher at which BaCO ₃ and BaCO ₃ sufficiently react is required. In this embodiment, the treatment was performed at 1050 ° C. for 2 hours. If necessary, a CIP (Cold Isostatic Pressing) treatment may be performed to densify the calcined bulk body. Such a sample was finally subjected to main firing at 1350 ° C. for 2 hours to obtain a crystal oriented barium titanate sintered body.

With respect to the crystal orientation of the sample obtained by the above method, the XRD diffraction incident on the sheet molding surface is (11)
1) A diffraction peak due to the plane is obtained, and the degree of orientation is 60%
Had the value of

Next, the same operation as in the above embodiment is performed,
Parameters such as raw material composition and sample preparation conditions
Making barium titanate sintered body with crystal orientation by various changes
Then, the piezoelectric performance was evaluated by the electromechanical coupling coefficient value.
The manufactured samples, their manufacturing conditions, and the
FIG. 3 shows the pneumatic-mechanical coupling coefficient values. Evaluation is BaTiO _Three
0 to the radial electromechanical coupling coefficient value of the non-oriented sample of
× 10% or more and less than 15% Δ, 15
% Or more and less than 20% were evaluated as ○. In addition, in FIG.
The conditions and evaluation results of the examples are as follows. 3
Hit.

The purpose and conditions for preparing the sample are as follows. (1) In forming a sheet, the weight ratio of the amount of binder to the amount of powder is changed to change the density of various ceramic greens. (2) Various samples having different degrees of orientation are prepared by changing the temperature during calcination to 850 ° C. to 1150 ° C. (3) Various samples having different relative densities are manufactured by changing the main firing time. (4) Ba ₆ Ti ₁₇ O ₄₀ , BaTiO ₃ , and BaCO ₃
Is slightly shifted from 6: 1: 17 in Example 1 to form a second phase other than the BaTiO ₃ phase, and determine the allowable range.

(5) As a sintering aid, lead germanate (P
GO) and lithium bismuth oxide as Ba ₆ Ti ₁₇ O ₄₀ +
Various samples are prepared by adding 2 wt% or less based on the weight of BaTiO ₃ + BaCO ₃ . (6) A ceramic compact is prepared by the interface sedimentation method. Specifically, the following operation was performed. 10 ml of hexane is used as a non-polar solvent, and Ba ₆ Ti ₁₇ O ₄₀ + BaTi
0.1 g weight of the mixed powder of O ₃ + BaCO ₃ was dispersed. And a surfactant 1 × 10 ^-4 such as Span 80 as a ^deflocculant
The suspension was obtained with an ultrasonic dispersing machine using less than 1 mol. This suspension was dropped into water of a non-polar solvent, and the powder was settled at rest. Then, the precipitated powder was transferred to an alumina sheet, and calcined through a two-stage drying process. The first drying step was performed for 6 hours in an atmosphere of 70% humidity, and the second drying was performed for 6 hours in an atmosphere of 35% humidity. By the above operation, a film having a thickness of 20 μm was obtained. The film thickness can be controlled by a simple calculation based on the amount of the ceramic powder in the suspension and the area of the bottom surface of the container used. The above steps were repeated to obtain a molded body, and finally heat-treated at 1300 ° C. to obtain a sample.

(7) A ceramic molded body is prepared by the aerosol method. That is, Ba ₆ Ti ₁₇ O ₄₀ + BaT
Powder composed of a mixed powder of iO ₃ + BaCO ₃ was aerosolized, transported to a carrier gas, and deposited on a stainless steel substrate. During the heat treatment, the stainless steel substrate was removed, and finally a heat treatment at 1300 ° C. was performed to obtain a sample. (8) as a method of molding the other ceramic body by aerosol method, the Ba ₆ Ti ₁₇ O _{4 0} aerosolized also Ba
When TiO ₃ + BaCO ₃ was converted into an aerosol and volume-formed on a substrate, both processes were performed simultaneously. Similarly, at the time of heat treatment, the stainless steel substrate was removed, and finally heat treatment at 1300 ° C. was performed to obtain a sample.

As a result of the above operations (1) to (8), good piezoelectric characteristics were obtained in Sample Nos. 3, 9 to 11, and 14 to 16 shown in FIG. At this time,
The calcining temperature is 1050 ° C, the main firing temperature when no auxiliary agent is used is 1350 ° C, and the time may be 1 to 2 hours, and the mixing ratio of the binder and the powder (powder / powder + binder) Is 0.7, Ba ₆ Ti ₁₇ O ₄₀ / BaTiO ₃ / BaC
The condition of a molar ratio of O ₃ of 1/17/11 was good.
In sample No. 14, the temperature of the main firing could be reduced to 1300 ° C. by using the PGO auxiliary. In addition, the sample No. In No. 15, good characteristics can be obtained by main baking at 1300 ° C. by interfacial sedimentation, and in Sample No. 16, 13
Good characteristics could be obtained by main firing at 00 ° C.

The (111) oriented sheet was obtained by cutting out the barium titanate crystal oriented product produced by the above method on the same plane as the sheet laminating direction. Also (10
With respect to the (0) orientation and the (001) orientation, various crystal orientation sheets can be obtained by cutting out at an appropriate angle from the sheet surface.

A part of the above BaTiO ₃ is replaced with SrTi
O ₃ , CaTiO ₃ , or PbTiO ₃ may be substituted.

[0054]

According to the first aspect of the present invention, a sintered body of a crystal oriented perovskite compound can be provided.
According to the second aspect of the present invention, it is possible to provide a sintered body of a crystal oriented perovskite compound having an average degree of orientation of 30% or more. According to the third aspect of the present invention, it is possible to provide a sintered body of a crystal oriented perovskite compound having a relative density value of 90% or more with respect to the theoretical density of the sintered body.

According to the invention of claim 4, it is possible to provide a sintered body in which 95% or more of the volume of the sintered body is made of a perovskite compound. According to the invention of claim 5, it is possible to provide a sintered body of crystallographically-oriented barium titanate. According to the invention of claim 6, it is possible to provide a sintered body of a crystal-oriented barium titanate-based compound including an ABO ₃ compound having at least one metal element among strontium, calcium, and lead.

According to the seventh aspect of the present invention, it is possible to provide a method for producing a sintered body of a crystal oriented perovskite compound. According to the invention of claim 8, it is possible to provide a method for producing a crystallographically-oriented barium titanate sintered body.

According to the ninth aspect of the present invention, it is possible to provide a suitable relative density of the ceramic green before the heat treatment in the method for producing a sintered body. According to the invention of claim 10, a sintered body composition of a perovskite compound can be provided. According to the eleventh aspect, it is possible to provide a suitable sintering aid in the material of the sintered body composition of the perovskite compound.

According to the twelfth to fourteenth aspects of the present invention, it is possible to provide a ceramic powder compact used for the crystal oriented perovskite compound. According to the invention of claims 15 and 16, a sintered body of a crystal-oriented perovskite compound can be provided. According to the invention of claim 17, a plate-like crystal oriented perovskite compound can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a unit cell having a perovskite structure.

FIG. 2 is a diagram for explaining an example of a production process of a crystal-oriented perovskite-type sintered body according to the present invention.

FIG. 3 is a table showing evaluation results of crystal-oriented barium titanate sintered bodies prepared by changing parameters such as a raw material configuration and sample preparation conditions.

[Explanation of symbols]

1 ... a composite oxide containing A and B, 2 ... a composite oxide containing A and B or A and B, 3 ... a sintering aid.

Claims (17)

[Claims] 1. A sintered body of a perovskite compound having a crystal orientation of a complex oxide represented by the general formula ABO ₃ , wherein A is a divalent metal element, and B is a tetravalent metal element. A sintered body of a crystal oriented perovskite compound, which is characterized in that: 2. The sintered body of the crystal oriented perovskite type compound according to claim 1, wherein
A sintered body of a crystalline oriented perovskite compound, characterized in that the average degree of orientation according to the ring method is 30% or more. 3. The sintered body of the crystal oriented perovskite compound according to claim 2, wherein a relative density value of the sintered body with respect to a theoretical density is 90% or more. Sintered body. 4. The sintered body of the crystal oriented perovskite type compound according to claim 3, wherein 95% of the volume of the sintered body is obtained.
A sintered body of a crystal-oriented perovskite compound, characterized by comprising a perovskite compound as described above. 5. The sintered body of a crystal oriented perovskite type compound according to claim 1, wherein the ABO ₃ comprises the A
Wherein the metal element is barium and the metal element B is titanium, and the crystal element is barium titanate. 6. The sintered body of a crystal-oriented perovskite compound according to claim 1, wherein the ABO ₃ contains
The metal element of is barium, the metal element of B is titanium, and the metal element of B is titanium; and the metal element of A is strontium, calcium, or lead, and the metal element of B is titanium. A sintered body of a crystal-oriented perovskite-type compound, which is a crystal-oriented barium titanate-based compound containing one or more kinds of a certain compound. 7. A composite oxide plate-like powder containing an element A and an element B, and one of a compound containing the element A, a compound containing the element B, and a compound containing both the elements A and B. A mixing step of mixing at least one kind of compound powder, a step of forming a ceramic green in which the plate-like powder is oriented using the mixed powder mixed in the mixing step, and performing a heat treatment on the ceramic green. ABO ₃
And a sintering step of synthesizing a crystal-oriented perovskite-type compound sintered body by the method described above. 8. The method according to claim 7, wherein the plate-like powder is Ba ₆ Ti ₁₇ O ₄₀ , wherein the compound powder mixed in the first step is Ba ₆ Ti ₁₇ O _40. A method for producing a sintered body of a crystal-oriented perovskite-type compound, wherein ABO ₃ obtained in the sintering step is a crystal-oriented barium titanate sintered body using BaCO ₃ and BaTiO ₃ powder. 9. The method for producing a sintered body of a crystal-oriented perovskite-type compound according to claim 7, wherein the relative density of the ceramic green is 60% or more. How to make the body. 10. A plate-like powder of a double oxide composed of an element A and an element B, a compound containing the element A, a compound containing the element B, and a compound containing both the elements A and B. A sintered body of a crystal-oriented perovskite compound formed of a material containing at least one compound powder and a sintering aid. 11. The sintered body of a crystal oriented perovskite compound according to claim 10, wherein the sintering aid is a lead germanate compound. 12. A compound containing the element A, a compound containing the element B, and one of the compounds containing both the elements A and B.
A first liquid obtained by dispersing a ceramic powder obtained by mixing a powder of a compound of at least one kind and a plate-like powder of a composite oxide composed of the element A and the element B in a nonpolar solvent is used as a second liquid. It is disposed on a polar solvent that is a liquid, and the ceramic powder is settled on the interface between the first liquid and the second liquid, and the sedimented ceramic powder is dried to form a sheet-shaped molded body. A molded body of ceramic powder used for a crystallographically oriented perovskite compound, characterized in that: 13. A composite oxide comprising a powder of at least one compound selected from the group consisting of a compound containing the element A, a compound containing the element B, and a compound containing both the elements A and B, and the compound A comprising the element A and the element B. Aerosolizing a ceramic powder obtained by mixing a plate-like powder of a product with an aerosol, and spraying the aerosol onto a supporting substrate simultaneously with a carrier gas, thereby obtaining a molded body formed by depositing the ceramic powder. A molded body of ceramic powder used for a crystal oriented perovskite compound. 14. A composite oxide comprising a powder of at least one compound selected from a compound containing the element A, a compound containing the element B, and a compound containing both the elements A and B, and the compound A comprising the element A and the element B. A first ceramic powder obtained by mixing a plate-like powder of a material with one or more of a compound containing the element A, a compound containing the element B, and a compound containing both the elements A and B; The second ceramic powder obtained by mixing the compound powder is aerosolized, and the aerosols are alternately or mixed at a fixed ratio and sprayed onto the supporting substrate at the same time as the carrier gas, thereby obtaining a ceramic powder. A molded body of ceramic powder used for a crystallographically oriented perovskite compound, characterized in that a molded body is obtained by depositing a body. 15. A sintered body of a crystal-oriented perovskite compound, obtained by laminating a plurality of the ceramic powder compacts according to claim 12 and subjecting the laminated body to heat treatment. 16. A sintered body of a crystal-oriented perovskite compound, which is synthesized by subjecting the ceramic powder compact according to claim 13 or 14 to heat treatment. 17. A plate-shaped crystal oriented perovskite type compound obtained by cutting out a sintered body of the crystal orientation perovskite type compound according to claim 15 or 16 in accordance with the crystal orientation direction.