锆钛酸铅的纯铁电回线分析

Pure Ferroelectric Hysteresis Loop of Lead Zirconate Titanate Ceramics

在0～150℃范围测量了Pb（Zr0.48Ti0.52）O3（PZT）陶瓷薄片的电滞回线和微分电滞回线。发现电滞回线高度在升温过程中出现升高的现象，这与铁电唯象理论相矛盾。为此提出精确测定纯铁电参数的方法，该方法可分离出回线中直流电导，非铁电性电容的影响，从而得到纯铁电效应的信号。实验结果与PZT中准同型相界的存在相吻合。

Hysteresis loop and differential hysteresis loop of Pb （Zr0 48Ti0. 52 ）03 （PZT） ceramics have been measured in the temperatures from 0 to 150℃. It is found that with the increase of temperatures, the height of hysteresis loop becomes larger, which is conflictive to the phenomenological theory of ferroelectricity. For this reason, a more precise measuring method for obtaining pure ferroelectric effect based on differential hysteresis loop is proposed. Using this method, the influence of DC conductance, non-ferroelectric linear capacitance can be eliminated, and obtain the signal of pure ferroelectric effects. The experimental result is in agreement with the existence of morphotropic phase boundary in PZT.