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无机材料学报

无机材料学报

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Mn掺杂BaTiO3基PTCR陶瓷相变的EPR研究

钱辰1; 李勇2; 唐小锋1; 唐子龙1; 钱劲1; 周志刚1   

  1. 1. 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室, 北京 100084; 2. 清华大学化学系, 北京 100084
  • 收稿日期:2000-06-13 修回日期:2000-08-07 出版日期:2001-07-20 网络出版日期:2001-07-20

EPR Investigation on the Phase Transition of Mn-Doped BaTiO3 PTCR Ceramics

QIAN Chen1; LI Yong2; TANG Xiao-Feng1; TANG Zi-Long1; QIAN Jin1; ZHOU Zhi-Gang 1   

  1. 1.State Key Laboratory of New Ceramics and Fine Processing; Department of Materials Science & Engineering; Tsinghua University; Beijing 100084; China; 2.Department of Chemistry; Tsinghua University, Beijing 100084, China
  • Received:2000-06-13 Revised:2000-08-07 Published:2001-07-20 Online:2001-07-20

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摘要： 为了探索利用ＥＰＲ谱线对ＰＴＣＲ陶瓷的相变及ＰＴＣ效应的机制研究的可能性，本文对接 Ｍｎ的 ＢａＴｉＯ３基正温度系数热敏电阻（简称ＰＴＣＲ）陶瓷在 １２０～４５０Ｋ温度范围内的电子顺磁共振谱进行了研究．得出了 Ｍｎ２＋离子 ＥＰＲ信号强度、 ｇ因子值和超精细耦合常数｜Ａ｜值的温度分布，发现ＥＰＲ参数与ＰＴＣＲ陶瓷相变有明显的对应关系，并给出微观结构上的初步解释．研究表明ＥＰＲ谱线以及精细结构的分析可以为ＰＴＣＲ陶瓷的相变机制以及ＰＴＣ效应的机制研究提供新的途径．

关键词: BaTiO3PTCR陶瓷, 相变, EPR, Mn2+信号, g因子, 超精细耦合常数

Abstract: The EPR (Electron Paramagnetic Resonance) spectra of Mn-doped BaTiO3 PTCR ceramics measured at 120~450K were studied. The signal intensity, the g factors and the hyperfine splitting constants |A| of Mn2+ at different temperatures were calculated. The results show that these parameters obviously correspond to the different phases of BaTiO3 based PTCR ceramics. This research indicates that EPR method can provide a new way to study upon mechanism of phase transition for PTCR ceramics.

Key words: BaTiO3 PTCR ceramics, phase transition, EPR, Mn2+ signal, g factor, hyperfine splitting constants

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