Liu Ye, Deng Shiqing, Li Jun, Huo Chuanrui, Wang Lu, Sun Shengdong, Zhang Yueyun, Wu Jie, Liu Hui, Qi He, Chen Jun
Beijing Advanced Innovation Center for Materials Genome Engineering, Department of Physical Chemistry, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
School of Mathematics and Physics, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
Adv Mater. 2022 Sep;34(36):e2204743. doi: 10.1002/adma.202204743. Epub 2022 Aug 7.
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, M (8 × 10 m V ) 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.
超高精度制造与检测凸显了研究具有弱激发外电场和同时具有大的无滞后应变的电致伸缩材料的重要性。在本研究中，通过构建复杂的非均匀局部结构设计了一种新型的电致伸缩弛豫铁电体，以实现优异的电致伸缩性能。实现了显著大的电致伸缩系数M（8×10⁻¹² m²/V²）。通过结合原子尺度的扫描透射电子显微镜和先进的原位高能同步辐射X射线衍射分析，观察到这种优异的电致伸缩性能可归因于一种特殊的畴结构，该结构由在菱方/四方/立方相的相界处嵌入极性基体中的内轴纳米析出物组成。基体由于高度灵活的极化和具有非极性中心区域的随机分散的内轴纳米析出物而在弱外电场下有助于高应变响应，这些纳米析出物提供了强大的恢复力，从而降低了应变滞后。本研究中开发的方法广泛适用于众多弛豫铁电体以及其他电介质，以进一步提高它们的电学性能，如电致伸缩和储能容量。
