无机材料学报

• 研究论文 • 上一篇    下一篇

67 Pb(Mg1/3Nb2/3)O3-33PbTiO_3单晶90°铁电畴光学研究

李东林; 王评初; 罗豪甦; 殷之文   

  1. 中国科学院上海硅酸盐研究所, 上海 200050
  • 收稿日期:1999-08-20 修回日期:1999-11-05 出版日期:2000-08-20 网络出版日期:2000-08-20

Optical Micoscope Study of 90° Ferroelectric Domain in 67 Pb(Mg1/3Nb2/3) O3-33PbTiO3 Solid Solution Single Crystal

LI Dong-Lin; WANG Ping-Chu; LUO Hao-Su; YIN Zhi-Wen   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:1999-08-20 Revised:1999-11-05 Published:2000-08-20 Online:2000-08-20

摘要: 采用偏光显微镜观察了67Pb(Mg1/3Nb2/3)O-33PbTiO固溶体铁电单晶在室温时 90°铁电畴结构.铁电畴结构与晶体质量有关,在正交偏光显微镜下光学透明晶体中存在着尺 寸为2~3mm的均匀大畴,不同极化方向的大畴重叠形成雾状区,使晶体表现出光学质量宏观 不均匀.在光学质量差的雾状晶体中则存在着 0.1mm宽的{110}型带状孪生畴,使晶体形成 表面浮凸,带状畴内还存在着90°亚畴.并对这些畴的形成作了讨论.

关键词: Pb(Mg1/3Nb2/3)O3基单晶, 弛豫铁电体, 铁电畴, 孪生, 马氏体转变

Abstract: 90° Ferroelectric domains in 67 Pb(Mg1/3Nb2/3) O3-33PbTiO3 single crystal were observed at room temperature by using crossed polarized light microscope(PLM). Ferroelectric domain structures depend on the quality of
single crystals. Large homogeneous domains of 2~3mm exist in optical transparent single crystals. Large domains with different polarization
orientation overlap to form opaque regions. {110} type 90° banded a-a domain with 90° sub-domain can be observed in translucent
crystals. The dimension of banded twin is about 0.1mm. As a result, surface relief appears on translucent crystal surface. The mechanism of forming
these domains was discussed.

Key words: Pb(Mg1/3Nb2/3) O_3-based crystal, relaxor ferroelectrics, ferroelectric domain, twin, marstensitic transition

中图分类号: