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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

BaTiO3晶体的电畴结构和单畴化方法

罗豪甦; 齐振一; 张冰阳; 仲维卓   

  1. 中国科学院上海硅酸盐研究所;上海 200050
  • 收稿日期:1996-05-27 修回日期:1996-07-12 出版日期:1997-06-20 网络出版日期:1997-06-20

DomAlN Structures and Poling Method of Barium Titanate Crystals

LUO Haosu; QI Zhenyi; ZHANG Bingyang; ZHONG Weizuo   

  1. Shanghai Institute of Ceramics; Chinese Academy of sciences Shanghai 200050 China
  • Received:1996-05-27 Revised:1996-07-12 Published:1997-06-20 Online:1997-06-20

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摘要： BaTiO3晶体的光折变应用之前，必须对晶体进行单畴化处理．根据BaTiO3晶体中90°电畴结构和包裹体之间的关系，我们找到一种在晶体极化之前就能有效地检查出BaTiO3晶体中包裹体的方法．根据BaTiO3晶体中90°电畴和180°电畴的形成特点，既可以让晶体以缓慢速度降温通过顺电-铁电相交点（1℃／15min），消去BaTiO3晶体的90°电畴，也可以用在α轴方向上施加一定的压力消去BaTiO3晶体的90°电畴．180°电畴可以在晶体的温度接近居里点时，通过在（001）面上施加1～3×105V／m的电场来消除

关键词: BaTiO3晶体, 相变, 电畴, 平面相界面, 极化

Abstract: The crystal BaTiO3 must be poled before its photorefractive applications. A technique forinspecting inclusions efficiently in the crystals has been established before poling crystals accordingto the 90° domAlN structures with the inclusions. With considering the character of the formationof 90° domAlN and 180° domAlN, the 90° domAlN can be removed by cooling crystal BaTiO3 slowlythrough the curie point (130.5℃), or by uniaxial pressing along a-axis. 180° domAlN can beremoved by applying electric field about 1～3×105V／m on the face （001）.

Key words: barium titanate, phase transition, domAlN, plane phase boundary, poling