由BaTiO_3晶体结构相变时的介电特性研究其电场作用下的偶极子偏转路径  

Study of the dipole rotation path of BaTiO_3 single crystal based on dielectric properties in structure phase transition

作　　者：李晓兵[1,2] 赵祥永[1] 汪尧进[1,2] 王飞飞[1,2] 陈超[1] 罗豪甦[1] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室,上海200050 [2]中国科学院研究生院,北京100049

出　　处：《物理学报》2009年第6期4225-4229,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50602047)资助的课题~~

摘　　要：在不同频率和偏置电场下测量了BaTiO3晶体从三方相到正交相再到四方相相变过程中的介电温谱.基于BaTiO3晶体在电场作用下的偶极子偏转假设和介电特性实验结果,提出BaTiO3各结构相在电场作用下的偶极子偏转路径可以由其相邻相的介电常数随温度的变化特性表现出来.推断出各结构相的偶极子偏转路径,以及偏置电场对偶极子偏转路径的影响.The temperature-dependence of dielectric-constant of BaTiO3 single crystals in （001 〉 direction is measured under different voltages and frequencies. The crystal experiences rhombohedral-orthorhombic-tetragonal phase transition with the increase of temperature. Base on the assumption of dipoles rotation and the experimental results of dielectric constant, a model is proposed, which holds that the dipoles rotation path can be inferred by the dielectric properties of the adjacent structure phase of BaTiO3. The dipoles rotation paths of rhombohedral, orthorhombic and tetragonal phases are given. The influences of bias dc electric field on the dipoles rotation path are discussed.

关 键 词：BATIO3晶体 介电特性 结构相变 偶极子偏转路径 

分 类 号：O792[理学—晶体学]