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Microstructure and dielectric properties of Ca1–3/2xBixCu3Ti4O12 (x = 0, 0.05, 0.10, 0.15 and 0.20) ceramics

  • L. F. Xu
  • T. Cheng
  • R. L. Wang
  • H. B. Xiao
  • G. Z. Liu
  • C. P. Yang
Article

Abstract

Influence of bismuth substitution on calcium site in CaCu3Ti4O12 has been investigated. Compositions of Ca1-3/2xBixCu3Ti4O12 (x = 0, 0.05, 0.10, 0.15 and 0.20) were fabricated by solid-state sintering method. Crystal structure is remained cubic. X-ray diffraction indicates the presence of secondary phase of CuO in CCTO ceramics. Bismuth doping restrains the formation of CuO phase apparently. The grain size of CaCu3Ti4O12 ceramics was greatly decreased by Bi3+ doping, resulting from the ability of bismuth to inhibit the grain growth. The dielectric and electric properties of CCTO ceramics were found to be influenced by bismuth doping. The fitting results of the complex impedance spectra showed an increase of the resistance of grain and grain boundary by bismuth substitution. Ca0.70Bi0.20Cu3Ti4O12 showed the highest dielectric constant in the low frequency range. A modest composition such as Ca0.85Bi0.10Cu3Ti4O12 expressed the optimized dielectric properties of higher dielectric constant (1.3 × 104) and lower dielectric loss (0.06) than pure CCTO. The low and high temperature dielectric loss spectra demonstrate the interfacial polarization of the initial and secondary oxygen ionization, relating with the grain and grain boundary (the electrode contact for Ca0.70Bi0.20Cu3Ti4O12) respectively.

Keywords

Bismuth Oxygen Vacancy Dielectric Permittivity CCTO Ceramic Inhomogeneous Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work is supported by the projects of Hubei Provincial Department of Education of China (Q20131007) and State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology)of China (SYSJJ2013-11).

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • L. F. Xu
    • 1
    • 2
  • T. Cheng
    • 1
  • R. L. Wang
    • 1
  • H. B. Xiao
    • 1
  • G. Z. Liu
    • 1
  • C. P. Yang
    • 1
  1. 1.Faculty of Physics and Electronic TechnologyHubei UniversityWuhanPeople’s Republic of China
  2. 2.Hubei Collaborative Innovation Center for Advanced Organic Chemical MaterialsHubei UniversityWuhanPeople’s Republic of China

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