CaCu3Ti4O12陶瓷的高温介电弛豫研究

doi:10.16039/j.cnki.cn22-1249.2019.03.018

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摘要

研究过渡金属氧化物在交变电场中的极化和弛豫行为有助于对此类化合物的输运机制的理解和介电、铁电等性能的优化。本文利用宽温宽频介电分析仪研究了CaCu₃Ti₄O₁₂(CCTO)陶瓷在室温以上的介电常数、弛豫和阻抗等性质。通过对阻抗谱的拟合分析表明，与室温以下介电弛豫机制不同，高温弛豫激活能与晶界电导激活能完全一致，说明高温下介电弛豫源于多晶陶瓷的晶界效应。

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	王文钧
	赵文静
	徐中坚
	刘军伟

关键词: CaCu₃Ti₄O₁₂ 介电弛豫阻抗谱热激活

Abstract:

The study of polarization and relaxation behavior for transition-metal oxides in alternating electric field is meaningful for the interpretation of their transport mechanism, dielectric and ferroelectric properties. The dielectric permittivity, relaxation and impedance properties above room temperature for CaCu₃Ti₄O₁₂ (CCTO) ceramic were studied by dielectric analyzer in a wide range of temperature and frequency. The fitting results of impedance indicate that the activation energy for high temperature is equal to that of electric conduction of grain boundary, which is different from the dielectric relaxation mechanism below room temperature. Our results suggest that the dielectric relaxation at high temperature is originated from the grain boundary effects of polycrystalline ceramic.

Key words: CaCu₃Ti₄O₁₂ dielectric relaxation impedance thermally activation

出版日期: 2019-03-25 发布日期: 2019-03-25 整期出版日期: 2019-03-25

ZTFLH:

O469

引用本文:

王文钧, 赵文静, 徐中坚, 刘军伟. CaCu₃Ti₄O₁₂陶瓷的高温介电弛豫研究 [J]. 吉林化工学院学报, 2019, 36(3): 88-91.
WANG Wenjun, ZHAO Wenjing, XU Zhongjian, LIU Junwei. Dielectric Relaxation of CaCu₃Ti₄O₁₂ Ceramic at High Temperature . Journal of Jilin Institute of Chemical Technology, 2019, 36(3): 88-91.

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http://xuebao.jlict.edu.cn/CN/10.16039/j.cnki.cn22-1249.2019.03.018 或 http://xuebao.jlict.edu.cn/CN/Y2019/V36/I3/88

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