随着尺寸的减小,铁电体将发生由多畴到单畴的变化以及铁电-顺电相变.发生多畴到单畴变化的尺寸称为单畴临界尺寸,发生铁电-顺电相变的尺寸称为铁电临界尺寸.本文报道了对铁电体尺寸效应研究的一些结果.对钛酸钡和钛酸铅,分别计算了这两个临界尺寸,计算结果与实验结果符合.
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