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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, Pmax, remanent polarisation, Pr, and the difference, Pmax−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, Pmax−Pr, between maximum polarization, Pmax, 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, Pmax−Pr, in maximum polarization, Pmax, and remanent polarisation, Pr, of the solid solution.
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, Pmax, remanent polarisation, Pr, and the difference, Pmax−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, Pmax−Pr, between maximum polarization, Pmax, 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, Pmax−Pr, in maximum polarization, Pmax, and remanent polarisation, Pr, of the solid solution.
Method of preparing a solid solution ceramic material having increased electromechanical strain, and ceramic materials obtainable therefrom
DAVID CANN (Autor:in) / BRADY GIBBONS (Autor:in) / PETER MARDILOVICH (Autor:in)
01.06.2022
Patent
Elektronische Ressource
Englisch
| Europäisches Patentamt | 2022
| Europäisches Patentamt | 2022
| Europäisches Patentamt | 2020
| Europäisches Patentamt | 2021