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METHOD OF PREPARING A SOLID SOLUTION CERAMIC MATERIAL HAVING INCREASED ELECTROMECHANICAL STRAIN, AND CERAMIC MATERIALS OBTAINABLE THEREFROM
The present invention relates to a method of preparing a solid solution ceramic material having increased electromechanical strain, as well as ceramic materials obtainable therefrom and uses thereof. In one aspect, the present invention provides a method A method of increasing electromechanical strain in a solid solution ceramic material which exhibits an electric field induced strain derived from a reversible transition from a non-polar state to a polar state; i) determining a molar ratio of at least one polar perovskite compound having a polar crystallographic point group to at least one non-polar perovskite compound having a non-polar crystallographic point group which, when combined to form a solid solution, forms a ceramic material with a major portion of a non-polar state; ii) determining the maximum polarization, P max, remanent polarisation, Pr,and the difference, P max- Pr, for the solid solution formed in step i); and either: iii)a) modifying the molar ratio determined in step i) to form a different solid solution of the same perovskite compounds which exhibits an electric field induced strain and which has a greater difference, P max- Pr, between maximum polarization, P max, and remanent polarisation, Pr, than for the solid solution from step i), or; iii)b) adjusting the processing conditions used for preparing the solid solution formed in step i) to increase the difference, P max- Pr, in maximum polarization, P max, and remanent polarisation, Pr, of the solid solution.
本发明涉及一种具有增大的机电应变的固溶体陶瓷材料的制备方法，以及由其可得的陶瓷材料和该陶瓷材料的用途。在一个方面中，本发明一种增大固溶体陶瓷材料的机电应变的方法，该固溶体陶瓷材料展示源自从非极性状态到极性状态的可逆转变的电场致应变；i)确定至少一种具有极性晶体学点群的极性钙钛矿型化合物与至少一种具有非极性晶体学点群的非极性钙钛矿型化合物的摩尔比，当二者组合以形成固溶体时，形成主要部分为非极性状态的陶瓷材料；ii)确定步骤i)中形成的固溶体的最大极化Pmax、剩余极化Pr、和差Pmax‑Pr；和以下中的任一者：iii)a)修改步骤i)中确定的摩尔比，以形成相同钙钛矿型化合物的不同固溶体，其展示电场致应变并且最大极化Pmax和剩余极化Pr之差Pmax‑Pr大于步骤i)的固溶体；或，iii)b)调节用于制备步骤i)中形成的固溶体的工艺条件，以增大固溶体的最大极化Pmax和剩余极化Pr之差Pmax‑Pr。
METHOD OF PREPARING A SOLID SOLUTION CERAMIC MATERIAL HAVING INCREASED ELECTROMECHANICAL STRAIN, AND CERAMIC MATERIALS OBTAINABLE THEREFROM
The present invention relates to a method of preparing a solid solution ceramic material having increased electromechanical strain, as well as ceramic materials obtainable therefrom and uses thereof. In one aspect, the present invention provides a method A method of increasing electromechanical strain in a solid solution ceramic material which exhibits an electric field induced strain derived from a reversible transition from a non-polar state to a polar state; i) determining a molar ratio of at least one polar perovskite compound having a polar crystallographic point group to at least one non-polar perovskite compound having a non-polar crystallographic point group which, when combined to form a solid solution, forms a ceramic material with a major portion of a non-polar state; ii) determining the maximum polarization, P max, remanent polarisation, Pr,and the difference, P max- Pr, for the solid solution formed in step i); and either: iii)a) modifying the molar ratio determined in step i) to form a different solid solution of the same perovskite compounds which exhibits an electric field induced strain and which has a greater difference, P max- Pr, between maximum polarization, P max, and remanent polarisation, Pr, than for the solid solution from step i), or; iii)b) adjusting the processing conditions used for preparing the solid solution formed in step i) to increase the difference, P max- Pr, in maximum polarization, P max, and remanent polarisation, Pr, of the solid solution.
本发明涉及一种具有增大的机电应变的固溶体陶瓷材料的制备方法，以及由其可得的陶瓷材料和该陶瓷材料的用途。在一个方面中，本发明一种增大固溶体陶瓷材料的机电应变的方法，该固溶体陶瓷材料展示源自从非极性状态到极性状态的可逆转变的电场致应变；i)确定至少一种具有极性晶体学点群的极性钙钛矿型化合物与至少一种具有非极性晶体学点群的非极性钙钛矿型化合物的摩尔比，当二者组合以形成固溶体时，形成主要部分为非极性状态的陶瓷材料；ii)确定步骤i)中形成的固溶体的最大极化Pmax、剩余极化Pr、和差Pmax‑Pr；和以下中的任一者：iii)a)修改步骤i)中确定的摩尔比，以形成相同钙钛矿型化合物的不同固溶体，其展示电场致应变并且最大极化Pmax和剩余极化Pr之差Pmax‑Pr大于步骤i)的固溶体；或，iii)b)调节用于制备步骤i)中形成的固溶体的工艺条件，以增大固溶体的最大极化Pmax和剩余极化Pr之差Pmax‑Pr。
METHOD OF PREPARING A SOLID SOLUTION CERAMIC MATERIAL HAVING INCREASED ELECTROMECHANICAL STRAIN, AND CERAMIC MATERIALS OBTAINABLE THEREFROM
具有增大的机电应变的固溶体陶瓷材料的制备方法和由其可得的陶瓷材料
CANN DAVID (author) / GIBBONS BRADY (author) / MARDILOVICH PETER (author)
2021-12-28
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
| European Patent Office | 2022
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| European Patent Office | 2022