【摘要】 铁电体的极化强度P是根据电滞回线计算的,但漏电电导、顺电电容、电极和样品表面接触层、pn结电阻等的影响使得精确测量回线非常困难.作者引入微分电滞回线谱分析方法,可将上述多种效应从总效应中定量扣除而得到纯铁电性的贡献.对锆钛酸铅陶瓷的测量结果表明,纯铁电微分回线可用少数几个高斯型函数精确拟合.疲劳效应表现为高斯函数个数,峰位U0、峰高I0、峰宽Δ等参数随极化反转次数N的增加持续变化.与电滞回线相比,微分回线是描述极化疲劳的更为严格有效的方法.更多还原

【Abstract】 Polarization P is usually calculated based on ferroelectric hysteresis loop, but it is hard to obtain an accurate loop because of the influence of leakage conductance, paraelectric capacitance, the pn junction between the sample’s surface and electrodes,A new method called differential hysteresis loop(DHL) has been introduced which is able to divide the above influences quantitatively and obtain pure ferroelectric effects. DHL of PZT ceramics can be well fitted by several Gaussian functions, furthermore, polarization fatigue can be described by the change of total number, positions, widths, heights of the Gaussian peaks. DHL is a more powerful tools for the analysis of polarization fatigue according to traditional hysteresis loop.更多还原