PMN铁电陶瓷B位有序与介电弛豫特性研究

无机材料学报

PMN铁电陶瓷B位有序与介电弛豫特性研究

李新元; 冯楚德; 李承恩; 鲍军

中国科学院上海硅酸盐研究所; 上海 200050

收稿日期:1998-02-27 修回日期:1998-04-08 出版日期:1998-12-20 网络出版日期:1998-12-20

Relationship Between Dielectric Relaxation Behavior and B-site Ordering of Lead Magnesium Niobate Ferroelectric Ceramics

LI Xin-Yuan; FENG Chu-De; LI Cheng-En; BAO Jun

Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China

Received:1998-02-27 Revised:1998-04-08 Published:1998-12-20 Online:1998-12-20

摘要/Abstract

摘要： 本文采用退火热处理及掺入La³⁺离子两种方法，利用高分辨透射电镜、选区电子衍射、X射线衍射等技术对B位离子有序结构与介电弛豫性能的关系进行分析．研究表明，B位离子有序化是直接提高弥散相变（DPT）程度的原因，其机理是离子扩散，存在扩散平衡．退火仅能提高有序度，无法改变有序区尺寸；通过La³⁺离子掺杂，可有效提高有序区域大小，由于是非化学计量比，造成Nb⁵⁺离子在无序区中过度富集，形成焦绿石相．

关键词: 弛豫铁电体, 有序-无序结构, 弥散相变, 介电弛豫

Abstract: The mechanism of the B-site ordering and disordering in Lead Magnesium Niobate (PMN) was examined by using both heat treatment and La-doped methods. The B-site structural ordering characteristics were exposed by
X-ray diffraction (XRD), selected area electron diffraction (SAED) and high-resolution electron microscopy (HREM). The reason of the pyrochlore
phase presenting with the La-doped increased was studied. Based on the analysis of dielectric properties, the increase in the degree of diffuse
phase transition (DPT) in annealed and La-doped PMN observed was interpreted as the Mg²⁺:Nb⁵⁺=1:1 nonstoichiometric short-range
ordered domain accompanied with the segregation of the Nb⁵⁺ in the disordered area. Furthermore, it was demonstrated that the kinetic mechanism
of the ordering micro-domain growing was ion diffusion equilibrium by the effects of the heat treatment on DPT properties of the various amounts
of La-doped.

Key words: relaxor ferroelectrics, order-disorder structure, diffuse phase transition, dielectric relaxtion

中图分类号:

TN304

李新元,冯楚德,李承恩,鲍军. PMN铁电陶瓷B位有序与介电弛豫特性研究[J]. 无机材料学报.

LI Xin-Yuan,FENG Chu-De,LI Cheng-En,BAO Jun. Relationship Between Dielectric Relaxation Behavior and B-site Ordering of Lead Magnesium Niobate Ferroelectric Ceramics[J]. Journal of Inorganic Materials.

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