物理化学学报 >> 2003, Vol. 19 >> Issue (02): 109-114.doi: 10.3866/PKU.WHXB20030204

研究论文 上一篇    下一篇

微波介质材料BaEu2Ti4O12的交流阻抗谱表征

荆西平;Anthony R.West   

  1. 稀土材料化学与应用国家重点实验室, 北京大学化学与分子工程学院，北京　100871;Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, UK
  • 收稿日期:2002-05-07 修回日期:2002-06-27 发布日期:2003-02-15
  • 通讯作者: 荆西平 E-mail:xpjing@chem.pku.edu.cn

AC Impedance Characterization for Microwave Dielectric Material BaEu2Ti4O12

Jing Xi-Ping;Anthony R. West   

  1. State Key Laboratory of Rare Earth Materials Chemistry and Application, College of Chemistry and Molecular Engineering, Peking University, Beijing　100871;Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD,UK
  • Received:2002-05-07 Revised:2002-06-27 Published:2003-02-15
  • Contact: Jing Xi-Ping E-mail:xpjing@chem.pku.edu.cn

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摘要： 采用交流阻抗谱技术对微波介质材料BaEu2Ti4O12进行了表征。分析了lgε/lgf, Z″/Z′和Y′/lgf等图谱的特征与材料性能的关系.研究结果表明：1）阻抗谱测试得到的介电常数与所发表的微波测试结果有很好的一致性,高频下得到的介电常数实际上是晶粒和晶界的净结果,高质量烧结的材料应具有薄的晶界，因而应表现出较大的介电常数; 2）如果将材料从高温下缓慢降温或在O2气氛中退火，材料的导电性都会下降，其原因可以理解为这样处理的材料氧空位浓度降低，进而可以推测这有利于降低材料的介电损失.

关键词: 交流阻抗谱, BaEu2Ti4O12, 微波介质材料

Abstract: The electrical properties of BaEu2Ti4O12 were characterized by means of AC impedance spectroscopy in the frequency rang of 10－1～107 Hz. The experiment results indicate: (i) the permittivity value measured in this low frequency range is compatible with the published value measured in microwave range. The permittivity value obtained in high frequency range is net effect of bulk and grain boundary permittivitis; better-sintered ceramic has thinner grain boundary and may have larger permittivity value; (ii) when the sample was cooled down slowly from elevated temperature or annealed in O2-rich atmosphere, the conductivity was reduced, which may be explained by the reduction of oxygen vacancies in crystal. These treatments may lower the dielectric loss in microwave range.

Key words: AC impedance, BaEu2Ti4O12, Microwave dielectric