A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
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
VERFAHREN ZUR HERSTELLUNG EINES KERAMIKMATERIALS AUS EINER FESTEN LÖSUNG MIT ERHÖHTER ELEKTROMECHANISCHER BEANSPRUCHUNG UND DARAUS HERSTELLBARE KERAMIKMATERIALIEN
PROCÉDÉ DE PRÉPARATION D'UN MATÉRIAU CÉRAMIQUE EN SOLUTION SOLIDE PRÉSENTANT UNE CONTRAINTE ÉLECTROMÉCANIQUE ACCRUE, ET MATÉRIAUX CÉRAMIQUES POUVANT ÊTRE OBTENUS PAR CE PROCÉDÉ
CANN DAVID (author) / GIBBONS BRADY (author) / MARDILOVICH PETER (author)
2022-03-30
Patent
Electronic Resource
English
| European Patent Office | 2022
| European Patent Office | 2020
| European Patent Office | 2022
| European Patent Office | 2021