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Critical state to achieve a giant electric field-induced strain with a low hysteresis in relaxor piezoelectric ceramics
Journal of Materiomics ( IF 9.4 ) Pub Date : 2021-01-24 , DOI: 10.1016/j.jmat.2021.01.007
Xiang Xia , Xingan Jiang , Jiangtao Zeng , Liaoying Zheng , Zhenyong Man , Huarong Zeng , Guorong Li

Due to the extrinsic contribution of domain wall motions to electro-strains, the incompatibility of the large electro-strain with a low hysteresis in piezoelectric ceramics is a stumbling block for designing high-performance piezoelectrical actuators. Herein, we report a critical state in relaxor ferroelectric systems enables to enhance the electro-strain and to reduce the hysteresis simultaneously. A room temperature ergodic relaxor state dominated by nanodomains with different local symmetries can be obtained by introducing Bi(Zn1/2Ti1/2)TiO3 into 0.73 Pb(Mg1/3Nb2/3)O3-0.27PbTiO3 matrix. Like the morphotropic phase boundary (MPB) in ferroelectrics, the coexistence of different local symmetries is capable of facilitating the transition from the ergodic relaxor state to the ferroelectric under the applied field due to the ease of polarization rotation, thereby leading to a giant electro-stain (0.24%) under an electric field of 50 kV/cm. Furthermore, the field-induced ferroelectric state with the long-range ferroelectric order can spontaneously reverse back to the initial ergodic relaxor state during unloading the electric field, which contributes to a low hysteresis (15.4%). The present work not only introduces a solid solution system with excellent electro-strain properties but also affords a guidance for manipulating the electro-strain behavior by modulating phase structures and domain configurations of piezoelectric ceramics.



中文翻译:

在弛豫压电陶瓷中实现具有低滞后的巨大电场诱导应变的临界状态

由于畴壁运动对电应变的外在贡献,压电陶瓷中大电应变与低滞后的不相容性是设计高性能压电致动器的绊脚石。在此,我们报告了弛豫铁电系统中的临界状态能够同时增强电应变并减少滞后。通过将Bi(Zn 1/2 Ti 1/2 )TiO 3引入0.73 Pb(Mg 1/3 Nb 2/3 )O 3 -0.27PbTiO 3 中,可以获得由具有不同局部对称性的纳米域主导的室温遍历弛豫态矩阵。与铁电体中的同向相界 (MPB) 一样,由于极化旋转的容易,不同局部对称性的共存能够促进在外加场下从遍历弛豫态到铁电体的转变,从而导致巨大的电-在 50 kV/cm 的电场下染色 (0.24%)。此外,具有长程铁电有序性的场致铁电态可以在卸载电场期间自发地逆转回初始遍历弛豫态,这有助于降低滞后(15.4%)。

更新日期:2021-01-24
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