LiTa_(0.9)Nb(0.1)O_3晶体及其结构相变的喇曼研究  

RAMAN STUDY OF STRUCTURE PHASE TRANSITION OF LiTa_(0.9)Nb_(0.1)O_3 Crystal

作　　者：葛云程[1] 赵朝忠[1] 李德敏[1] 袁斯伟[1] 

机构地区：[1]哈尔滨师范大学

出　　处：《哈尔滨师范大学自然科学学报》1993年第3期42-46,共5页Natural Science Journal of Harbin Normal University

摘　　要：本文利用喇曼散射方法系统地研究了钽铌酸锂(LiTa_(0.9)Nb_(0.1)O_3)晶体的晶体振动及其高温下发生的由铁电相到顺电相的结构相变。常温实验中,观察到了所有喇曼激活的模式,与群论分析的结果相符合。高温实验中,发现钽铌酸锂的相变过程中有模式软化的现象发生,但软模并未软化至零频率,即结构相变并非软模导致的位移型相变而是一种有序—无序型的相变。Using Raman scattering spectra we have studied the lattice vibration and structural phase transition of LiTa_(0.9)Nb_(0.1)O_3 crystal, All Raman active modes have been ahrerved in accondance with group theory analysis. On high temperature experiments mode softening phenomena occured, but the soft mode haven't soften to zero hrequency. and the phase transition of LiTa_(0.9)Nb_(0.1)O_3 crystal isn't displacine type, but order—disorder type.

关 键 词：结构相变 钽铌酸锂 

分 类 号：TM224[一般工业技术—材料科学与工程]