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无机材料学报

• 研究论文 • 上一篇    

退火处理对PMN弛豫铁电体B位有序性研究

李新元; 冯楚德; 李承恩; 庄志诚+   

  1. 中国科学院上海硅酸盐研究所 上海 200050; +上海交通大学 上海 200030
  • 收稿日期:1998-08-13 修回日期:1998-10-22 出版日期:1999-08-20 网络出版日期:1999-08-20

Effect of Heat Treatment on B site Ordering of Lead Magnesium Niobate Ferroelectric Ceramics

LI Xin-Yuan, FENG Chu-De, LI Cheng-En, ZHUANG Zhi-Cheng +   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China;+ Shanghai Jiaotong University Shanghai 200030 China
  • Received:1998-08-13 Revised:1998-10-22 Published:1999-08-20 Online:1999-08-20

PDF (PC)

1071

被引次数

4

摘要： 本文采用退火热处理方法， 利用高分辨透射电镜（ Ｈ Ｒ Ｅ Ｍ） 、选区电子衍射（ Ｓ Ａ Ｅ Ｄ） 、 Ｒａｍａｎ 光谱等技术对 Ｐ Ｍ Ｎ 中 Ｂ 位离子有序无序结构与微区化学组成的关系进行分析研究表明， 退火热处理有助于 Ｂ 位离子有序化； 并且 Ｂ 位离子的有序排列是产生局部化学组成不均匀性的原因.

关键词: 弛豫铁电体, 有序-无序结构, 化学键

Abstract: The mechanism of B site ordering and disordering in Lead Magnesium Niobate (PMN) was examined by heat treatment at different annealing time The B-site structural ordering characteristics were exposed by selected area electron diffraction (SAED) and high resolution electron microscopy (HREM) By analyzing the different types of chemical bonds in the BO6 network by the Raman spectroscopy, it was demonstrated that ordered domains in PMN are Mg rich region while disordered domains are Mg poor (or Nb-rich).

Key words: relaxor ferroelectrics, order disorder structure, chemical bond

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