ABSTRACT Reversible electrostrictive effect in ferroelectrics of double-well free energy is modeled using the Devonshire theory. The idea is developed that in tetrogonal phase 90° turnings of dipoles from four poling axises, isoenergetic minima, perpendicular to electrical field to the direction of electrical field cause electrostriction. Numerical simulation results exhibit that the exchanging coupling coefficient between dipoles results in a butterfly shaped electrostriction loop. Influences of temperature and the two parameters of materials on shape of electrostriction loop are discussed, and an empirical experimental law, about magnitude of electrostriction with the Curie constant, is confirmed.

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二阶相变铁电体的电致伸缩效应研究

摘要双阱自由能铁电体中的可逆电致伸缩效应使用德文郡理论建模。开发的想法是，在四角形相位中，偶极子从四个极化轴、等能最小值、垂直于电场方向到电场方向的 90°转向引起电致伸缩。数值模拟结果表明，偶极子之间的交换耦合系数导致了蝶形电致伸缩环。讨论了温度和材料的两个参数对电致伸缩环形状的影响，并确定了关于电致伸缩大小与居里常数的经验实验规律。