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添加Nb对CaCu3Ti4O12陶瓷介电性能的影响

刘 鹏 贺 颖 李 俊 朱刚强 边小兵

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添加Nb对CaCu3Ti4O12陶瓷介电性能的影响

刘 鹏, 贺 颖, 李 俊, 朱刚强, 边小兵

Influence of Nb doping on the dielectric properties of CaCu3Ti4O12 ceramics

Liu Peng, He Ying, Li Jun, Zhu Gang-Qiang, Bian Xiao-Bing
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  • 采用固相反应法制备了CaCu3Ti4-xNbxO12(x=0,0.01,0.04,0.08,0.2)陶瓷,样品在x取值范围内形成了连续固溶体.在40Hz—110MHz频率范围对样品进行了介电频谱分析,实验结果表明,与纯CaCu3Ti4O12不同,含Nb试样除了在频率大于10kHz范围内出现的德拜弛豫
    The CaCu3Ti4-xNbxO12(x=0,0.01,0.04,0.08,0.2) ceramics have been prepared by solid-state reaction. The XRD of the sintered ceramics indicated that complete solutions are formed for all compositions x. Dielectric properties have been investigated in the frequency range from 40Hz to 110MHz. Compared with the un-doped CCTO sample,a Debye-type dielectric relaxation has been observed for the Nb-doping CCTO samples in the frequency range from 40Hz to 10kHz at room temperature,apart from the one already known in the frequency range higher than 10kHz. Moreover,the dielectric constant reaches 106 below the characteristic frequency of the lower frequency dielectric relaxation peak which shifts to higher-frequency with increasing Nb content. The experimental results are well explained in terms of the barrier layer capacitance model and an equivalent circuit containing three RC elements by showing three semicircles in the impedance spectroscopic plane.
    • 基金项目: 国家自然科学基金(批准号:50572059)和教育部优秀青年教师资助计划(2003年)资助的课题.
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  • 文章访问数:  4284
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  • 被引次数: 0
出版历程
  • 收稿日期:  2006-12-17
  • 修回日期:  2007-01-24
  • 刊出日期:  2007-09-20

添加Nb对CaCu3Ti4O12陶瓷介电性能的影响

  • 1. 陕西师范大学物理学与信息技术学院,西安 710062
    基金项目: 

    国家自然科学基金(批准号:50572059)和教育部优秀青年教师资助计划(2003年)资助的课题.

摘要: 采用固相反应法制备了CaCu3Ti4-xNbxO12(x=0,0.01,0.04,0.08,0.2)陶瓷,样品在x取值范围内形成了连续固溶体.在40Hz—110MHz频率范围对样品进行了介电频谱分析,实验结果表明,与纯CaCu3Ti4O12不同,含Nb试样除了在频率大于10kHz范围内出现的德拜弛豫

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