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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

Y和YF3掺杂钛酸钡系PTCR材料的结构及性能

黄传勇; 唐子龙; 张中太   

  1. 清华大学材料科学与工程系, 北京 100084
  • 收稿日期:1999-08-09 修回日期:1999-09-22 出版日期:2000-08-20 网络出版日期:2000-08-20

Structure and Property of Y and YF3 Doped Barium Titanate

HUANG Chuan-Yong; TANG Zi-Long; ZHANG Zhong-Tai   

  1. Department of Materials Science and Engineering; Tsinghua University; Beijing 100084; China
  • Received:1999-08-09 Revised:1999-09-22 Published:2000-08-20 Online:2000-08-20

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摘要： 在不同烧结气氛下制备了Ｙ和ＹＦ３掺杂钛酸钡材料，借助于ＸＲＤ、ＳＥＭ、ＸＲＦ和阻温测试分析仪，研究了烧结气氛对Ｙ和ＹＦ３掺杂钛酸钡材料结构和性能的影响．研究结果表明，低氧分压气氛可促进Ｙ和ＹＦ３掺杂钛酸钡材料的烧结，晶粒长大，而且这二种掺杂钛酸钡材料都是ｎ型半导体．经过氩气气氛烧结的Ｙ掺杂钛酸钡材料ＰＴＣＲ效应较弱；而对在氩气气氛中烧结的０．３ｍｏｌ％ＹＦ３掺杂钛酸钡材料却观察到了较好的ＰＴＣＲ效应，这种效应的产生可能与Ｆ元素取代Ｏ位而导致材料的价控半导有关．

关键词: 钛酸钡, PTCR效应, 气氛烧结, 取代机制

Abstract: Positive Temperature Coefficient of Resistivity (PTCR) materials based on Yttrium and Yttrium Fluoride (YF3) doped Barium titanate (BaTiO3) ceramics were prepared in different sintering atmospheres, respectively. The effects of
sintering atmospheres on the microstructure, property and mechanism of substitution of doped BaTiO3 ceramics were investigated by the means of XRD, SEM, XRF
and R-T measuring instrument. Sintering in a low oxygen partial atmosphere can increase the densities of Y and YF3 doped BaTiO3 and make grain particle
grow. Both Y and YF3 doped BaTiO3 ceramics are n-type semiconductor in which Y substitutes A-site and F substitutes O-site. Sintered in a argon
atmosphere, Y doped BaTiO3 exhibited little PTCR effect, however, an anomalous PTCR effect was observed when 0.3mol% YF3doped BaTiO3 ceramics was fired
in Argon atmosphere. This phenomenon may be explained by a new O site substitution mechanism.

Key words: barium titanate, PTCR effect, sintering atmosphere, substitution

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