PMN-PT弛豫铁电固溶体的定向凝固组织与结晶习性

无机材料学报

PMN-PT弛豫铁电固溶体的定向凝固组织与结晶习性

孙士文^1,2; 潘晓明²; 李东林²; 李洪钧²; 朱丽慧¹; 黄清伟²; 王评初²

1. 上海大学材料学院, 上海 200072; 2. 中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室, 上海 200050

收稿日期:2003-04-16 修回日期:2003-06-13 出版日期:2004-05-20 网络出版日期:2004-05-20

Structure and Grain Growth Habit of Directional Solidification Ceramics of (1-x)Pb(Mg_1/3Nb_2/3)O₃ - xPbTiO₃ (x=0.30, 0.33, 0.38) Relaxor Ferroelectric Solid Solutions

SUN Shi-Wen^1,2; PAN Xiao-Ming²; LI Dong-Lin²; LI Hong-Jun²; ZHU Li-Hui¹; HUANG Qing-Wei²; WANG Ping-Chu²

1.School of Materials Science and Engineering; Shanghai University; Shanghai 200072; China; 2. State Key Laboratory of High Performance Ceramics and Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China

Received:2003-04-16 Revised:2003-06-13 Published:2004-05-20 Online:2004-05-20

摘要/Abstract

摘要： 研究了(1-x)Pb(Mg_1/3Nb_2/3)O₃-xPbTiO₃(简称PMN-PT或PMNT)系铁电固溶体在坩埚下降法定向凝固过程中的结晶与晶粒生长习性.结果表明,随着坩埚下降速度的加快和PbTiO₃含量的降低,陶瓷晶粒的择优生长方向由[111]逐渐向[110]转变。

关键词: PMN-PT, 定向陶瓷, 结晶习性

Abstract: This work describes the grain growth habit of the (1-x)Pb(Mg_1/3Nb_2/3)O₃-xPbTiO₃
(PMN-PT or PMNT) system ferroelectric solid solutions prepared by a directional solidification technique. The results show that the preferential
direction of the grain growth depends not only on the composition of the melts, but also on the crucible pulling-down speed. For a fixed PMN/PT
ratio, e.g. 62/38, higher speed of crucible pulling-down leads to a preferential grain growth orientation of [110], rather than the [111],
which is usually reported in single crystal growth studies, whereas lower crucible pulling-down speed tends to produce [111] grain-orientation
ceramics. When the crucible is pulled down at a certain rate, the preferential grain-growth orientation changes from [111] to [110] with reducing PbTiO₃
molar contents.

Key words: PMN-PT, directional solidification ceramics, grain growth habit

中图分类号:

O732

孙士文,潘晓明,李东林,李洪钧,朱丽慧,黄清伟,王评初. PMN-PT弛豫铁电固溶体的定向凝固组织与结晶习性[J]. 无机材料学报.

SUN Shi-Wen,PAN Xiao-Ming,LI Dong-Lin,LI Hong-Jun,ZHU Li-Hui,HUANG Qing-Wei,WANG Ping-Chu. Structure and Grain Growth Habit of Directional Solidification Ceramics of (1-x)Pb(Mg_1/3Nb_2/3)O₃ - xPbTiO₃ (x=0.30, 0.33, 0.38) Relaxor Ferroelectric Solid Solutions[J]. Journal of Inorganic Materials.

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