摘要
在不同的边界条件下，考虑到钛酸铅的晶粒界面能和表面自由能，利用广义的Ｃｌａｕｓｉｕｓ－Ｃｌａｐｅｙｒｏｎ关系式以及Ｌａｎｄａｕ－Ｇｉｎｓｂｕｒｇ－Ｄｅｖｏｎｓｈｉｒｅ热力学方程，求得了在不同受力状态、薄膜厚度及超微粒子的晶粒尺寸与自发极化强度和铁电相变温度之间的关系，理论分析能够很好地解释实验现象。综合文献的报道，对钛酸铅的铁电物性给予了全面的总结。
A phenomenological thermodynamic theory of PbTiO_3 was developed using generalized Clausius-Clapeyron relations and a modified Landau-Ginsburg-Devonshire form of the elastic Gibbs free energy under various boundary conditions.For PbTiO_3 thin films and ultrafine particles,large amount of grain boundary energy and surface free energy are considered.The theoretical prediction of the relationship between ferroelectric phase transition temperature and spontaneous polarization versus film thickness,stress,particle size agrees well with experimental data,In addition,ferroelectric and piezoelectric properties of PBTiO_3 materials are summarized,based on the literatures.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1996年第4期423-429,共7页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金
关键词
钛酸铅
薄膜
热力学
铁电相变
铁电体
s:lead titanate,thin film,ultrafine particle,thermodynamic,ferroelectric phase transition
