晶体中负离子配位多面体结晶方位、形变与晶体压电、铁电性  

Orientation and Distortion of Anionic Coordination-polyhedra in Crystals and the Piezoelectric and Ferroelectric Properties

作　　者：仲维卓[1] 张学华[1] 罗豪甦[1] 华素坤[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海201800

出　　处：《人工晶体学报》2006年第1期1-5,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金(No.50272075;No.50432030和No.50331040);国家863高新技术项目(No.2002AA325130);中国科学院上海硅酸盐研究所创新基金(SCX200411);中国科学院创新工程(KJCXZ-SW-105-03)资助项目

摘　　要：本文研究了压电、铁电晶体中负离子配位多面体的结晶方位与形变,提出了压电晶体中同一种负离子配位多面体的结晶方位是一致的。在铁电晶体中,负离子配位多面体发生形变,伴随着晶体发生顺电-铁电相变,并从这一基本过程出发,对铁电体相变的形成机理进行了讨论。The orientation and distortion of anionic coordination-polyhedra in piezoelectric and ferroelectric crystals are studied in this article. It was put forward that the orientation of the same anionic coordination-polyhedra is consistent in piezoelectric crystal, and that the distortion of anionic coordination-polyhedra is accompanied by paraelectric-ferroelectric phase transition in ferroelectric crystal. The mechanism of phase transitions in ferroelectrics was discussed through this basic process.

关 键 词：负离子配位多面体 压电性 铁电性 自发极化 相变 

分 类 号：O78[理学—晶体学]