| Mn掺杂BaTiO_3基PTCR陶瓷相变的EPR研究 |
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| 引用本文： | 钱辰,李勇,唐小锋,唐子龙,钱劲,周志刚. Mn掺杂BaTiO_3基PTCR陶瓷相变的EPR研究[J]. 无机材料学报, 2001, 16(4) |
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| 作者姓名： | 钱辰 李勇 唐小锋 唐子龙 钱劲 周志刚 |
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| 基金项目： | 国家自然科学基金（59672012） |
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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．
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| 关 键 词： | BaTiO3PTCR陶瓷 相变 EPR Mn2 信号 g因子 超精细耦合常数 |
EPR Investigation on the Phase Transition of Mn-Doped BaTiO_3 PTCR Ceramics |
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| QIAN Chen,LI Yong,TANG Xiao-Feng,TANG Zi-Long,QIAN Jin,ZHOU Zhi-Gang. EPR Investigation on the Phase Transition of Mn-Doped BaTiO_3 PTCR Ceramics[J]. Journal of Inorganic Materials, 2001, 16(4) |
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| Authors: | QIAN Chen LI Yong TANG Xiao-Feng TANG Zi-Long QIAN Jin ZHOU Zhi-Gang |
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| 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. |
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| Keywords: | BaTiO3 PTCR ceramics phase transition EPR Mn2 signal g factor hyperfine splitting constants |
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