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Fe掺杂CaCu3Ti4O12陶瓷的介电性能与弛豫特性研究

慕春红 刘 鹏 贺 颖 张 丹 孟 玲 边小兵

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Fe掺杂CaCu3Ti4O12陶瓷的介电性能与弛豫特性研究

慕春红, 刘 鹏, 贺 颖, 张 丹, 孟 玲, 边小兵

Study on the dielectric properties and dielectric relaxation of Fe-doped CaCu3Ti4O12 ceramics

Mu Chun-Hong, Liu Peng, He Ying, Zhang Dan, Meng Ling, Bian Xiao-Bing
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  • 采用固相反应法制备了CaCu3Ti4-xFexO12(0≤x≤0.2)陶瓷,通过X射线衍射、扫描电子显微镜、介电频谱和阻抗谱等手段研究了Fe对CaCu3Ti4O12陶瓷的结构和介电性能的影响.研究发现:CaCu3Ti4-xFex
    The CaCu3Ti4-xFexO12 (0≤x≤0.2) ceramics have been prepared by a standard solid-state reaction method, and the influence of Fe doping on the microstructure and dielectric properties of CaCu3Ti4-xFexO12 ceramics were investigated by the X-ray diffraction, scanning electron microscopy, dielectric spectroscopy and impedance spectroscopy. It has been found that complete solid solutions are formed for all of the compositions x. With the increase of Fe content, the semiconductivity of grain vanishes gradually and the dielectric constant decreases. For specimens with x≤0.04, the two dielectric relaxation process Ⅰ and Ⅱappeared in the frequency ranges of 106—108 and 103—104 Hz, respectively. These two dielectric relaxation process were considered to be associated with grain boundaries and interfacial polarization between the electrode and ceramic surface, respectively. In addition, the third dielectric relaxation Ⅲ was detected in the high-temperature dielectric spectroscopy of CaCu3Ti3.99Fe0.01O12 ceramic, which was caused by a hopping process of localized charge carriers. The activation energy of this thermally excited relaxation is 0.78 eV, as obtained by using the Arrhenius formula.
    • 基金项目: 国家自然科学基金(批准号:50572059)资助的课题.
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  • 文章访问数:  4519
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  • 被引次数: 0
出版历程
  • 收稿日期:  2007-09-10
  • 修回日期:  2007-10-31
  • 刊出日期:  2008-02-05

Fe掺杂CaCu3Ti4O12陶瓷的介电性能与弛豫特性研究

  • 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)资助的课题.

摘要: 采用固相反应法制备了CaCu3Ti4-xFexO12(0≤x≤0.2)陶瓷,通过X射线衍射、扫描电子显微镜、介电频谱和阻抗谱等手段研究了Fe对CaCu3Ti4O12陶瓷的结构和介电性能的影响.研究发现:CaCu3Ti4-xFex

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