论文标题
菱形铁电逆转极化的多步随机机制
Multi-step stochastic mechanism of polarization reversal in rhombohedral ferroelectrics
论文作者
论文摘要
开发了菱形铁电性中野外极化逆转的随机模型，从而描述了它们的时间机械响应。该模型将模型的应用在菱形的PB（ZR，TI）O3陶瓷窗口中同时测量极化和应变动力学，从而可以鉴定可取的开关路径，单个切换过程的分数以及其激活场。补充，现象学Landau-Ginzburg-Devenshire理论用于分析外部场和应力对切换屏障的影响，表明残留机械应力可能促进快速切换。
A stochastic model for the field-driven polarization reversal in rhombohedral ferroelectrics is developed, providing a description of their temporal electromechanical response. Application of the model to simultaneous measurements of polarization and strain kinetics in a rhombohedral Pb(Zr,Ti)O3 ceramic over a wide time window allows identification of preferable switching paths, fractions of individual switching processes, and their activation fields. Complementary, the phenomenological Landau-Ginzburg-Devenshire theory is used to analyze the impact of external field and stress on switching barriers showing that residual mechanical stress may promote the fast switching.
