MIXED FERROELECTRIC PHASE TRANSITIONS IN CRYSTALS LITHIUM TANTALATE AND LITHIUM NIOBATE

被引：0
|
作者：
张明生
机构：
[1] Center for Materials Analysis and State Laboratory of Solid State Microstractures Nanjing University
[2] Nanjing 210008
[3] PRC
来源：
Progress in Natural Science:Materials International | 1991年 / 06期
基金：
中国国家自然科学基金;
关键词：
lithium tantalate; lithium niobate; mixed phase transition; displacive; order-disorder;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Ⅰ.INTRODUCTIONLithium tantalate LiTaO3and lithium niobate LiNbO3are ferroelectric materials ofABO3structure with oxygen octahedrons.Their ferroelectric properties are similar to those ofthe perovskites,although neither of them belongs to perovskite structure.The Curie point inLiNbO3is at 1480 K and in LiTaO3is sample-dependent,a temperature range of 50 K from880 to 930 K in LiTaO3is measured by the measurements of pyroeloctric effects,refractiveindexes and dielectric constants.Such a sample dependence of the transition is foundto be related to the growth conditions,internal components and internal stress in the crys-tals.
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页码：497 / 504
页数：8
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