第一次研究了PbMg1/3Nb2/3O3-PbTiO3(PMN-PT)和Ba1-xSrxTiO3(BST)铁电陶瓷的低频高场电循环下的疲劳及其采用在顺电相保温20min去疲劳的效果.实验表明:PMN-PT和BST相比,同样条件下的电循环后PMN-PT易产生明显的疲劳;但BST从一开始就有少量的疲劳存在,PMN-PT则直到5×104才开始出现疲劳.同样的电循环数后,去除疲劳的效果不一样:BST在靠近Tc处比PMN-PT靠近Tm处去除疲劳的效果好,但60℃后在增加温度仍有部分疲劳不能消除,直到150℃时疲劳仍不能完全消除;而PMN-PT在110℃时疲劳已完全消除.本文用极性微区理论和外场诱导相变理论很好地解释了以上现象.
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