3D铁电极化微观结构的构建及诱导挠曲电应变下极化不变量的检测
Construction of 3D-Ferroelectric Polarization Microstructure and Detection of Polarization Invariants under Induced Flexoelectric Strains
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中文总结 AI 辅助
本研究开发结合PFM的极化分量分辨成像技术，在BCZT薄膜中引入挠曲电应变检测到高压下的单斜相新极化不变量，为异相多晶体系逆模型开发奠定基础。
中文摘要 AI 辅助
异相多晶铁电薄膜具有应变敏感的压电行为，但人们对给定晶粒内的极化取向以及机械应力如何重构铁弹耦合极化取向的直接认识仍不明确。本研究开发了一种压电力显微镜（PFM）中极化分量分辨成像技术，并结合关联结构与声子研究，以获取晶粒取向、畴结构及弯曲应力驱动的相变信息；该技术关联了极化不变量与下方对应的晶粒取向，为从铁电畴确定晶体学晶粒取向提供了实验性逆模型方法。本研究采用三点弯曲台在Ba0.85Ca0.15Zr0.1Ti0.9O3（BCZT）薄膜中引入挠曲电应变，同时进行极化成像，该新技术可捕捉高压下出现的单斜相新极化不变量的形成；实验结果为异相多晶体系的逆模型开发铺平了道路。
英文摘要
Ferroelectric thin films that are heterophased and polycrystalline possess strain sensitive piezoelectric behavior. However, a direct insight into polarization orientations within a given grain and how mechanical stresses reconfigures the ferro elastically coupled polarization orientations remains ambiguous. A polarization component resolved imaging in a Piezoresponse Force Microscope (PFM) was developed in combination with correlative structure and phonon studies that provide insights into grain orientation, domains and bending stress driven phase transitions. The method correlates the polarization invariant and the respective grain orientations present underneath. The technique facilitates an experimental inverse model approach to determine crystallographic grain orientation from the ferroelectric domain. A three point bending stage introduces a flexoelectric strain in Ba0.85,Ca0.15Zr0.1Ti0.9O3_BCZT thin films and simultaneous polarization imaging. This novel technique potentially captures the formation of new polarization invariant of a monoclinic phase that appears under high pressures. The experimental findings pave way for development of inverse modelling of heterophased and polycrystalline systems.
