电致伸缩
材料科学
电场
铁电性
凝聚态物理
压电
极化(电化学)
四方晶系
磁滞
电介质
相(物质)
复合材料
光电子学
物理
物理化学
量子力学
有机化学
化学
作者
Ye Liu,Shiqing Deng,Jun Li,Chuanrui Huo,Lu Wang,Shengdong Sun,Yueyun Zhang,Jie Wu,Hui Liu,He Qi,Jun Chen
标识
DOI:10.1002/adma.202204743
摘要
Ultrahigh-precision manufacturing and detection have highlighted the importance of investigating electrostrictive materials with a weak stimulated extrinsic electric field and a simultaneous large hysteresis-free strain. In this study, a new type of electrostrictive relaxor ferroelectric is designed by constructing a complex inhomogeneous local structure to realize excellent electrostrictive properties. A remarkably large electrostrictive coefficient, M33 (8 × 10-16 m2 V-2 ) is achieved. Through a combined atomic-scale scanning transmission electron microscopy and advanced in situ high-energy synchrotron X-ray diffraction analysis, it is observed that such superior electrostrictive properties can be ascribed to a special domain structure that consists of endotaxial nanoprecipitations embedded in a polar matrix at the phase boundary of the rhombohedral/tetragonal/cubic phases. The matrix contributes to the high strain response under the weak extrinsic electric field because of the highly flexible polarization and randomly dispersed endotaxial nanoprecipitations with a nonpolar central region, which provide a strong restoring force that reduces the strain hysteresis. The approach developed in this study is widely applicable to numerous relaxor ferroelectrics, as well as other dielectrics, for further enhancing their electrical properties, such as electrostriction and energy-storage capacity.
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