铁电微分回线谱参数和极化疲劳

Differential Hysteresis Loop of Ferroelectrics and Polarization Fatigue

用铁电微分回线谱分析方法研究了Ba0.99Sr0.01TiO3陶瓷的极化疲劳效应,该方法可将线性和非线性电导、非铁电极化电容、以及纯铁电极化信号完全分开．实验给出各效应对应的微分谱线型参数在疲劳过程中的变化规律,并据此分出样品中分别由180°畴和90°畴提供的极化,发现在同等作用下,180°畴提供的极化更快出现疲劳．

By means of ferroelectric differential hysteresis loop spectra, the polarization fatigue of Bao.99Sr0.01TiO3 ceramics was carefully studied. The effects of conductance, paraelectrics and pure ferroelectrics could be definitely separated. The results show that the polarization fatigue arose from 180° domain appears much faster than that arose from 90° domain. Ferroelectric differential loop spectra are proved to be a much more powerful method to describe polarization fatigue than traditional hysteresis loop.