钛酸钡和钛酸铅的两个临界尺寸

Two Critical Sizes of Barium Titanate and Lead Titanate

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一顺电相变.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.

With the size decreasing, a ferroelectric will change from multi-domain to single-domain and then from ferroelectric to paraelectric. The size at which a ferroelectric changes from muti-domain to single-domain is called the single-domain critical size, and the size below which ferro electricity disappears is called the ferroelectric critical size. In this work, we calculated the two critical sizes for barium titanate and lead titanate respectively. The calculated results accord with experimental.