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Non-Ohmic and dielectric properties of Ba-doped CaCu3Ti4O12 ceramics

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Abstract

The microstructure, dielectric and electrical properties of Ca1−x Ba x Cu3Ti4O12 (where x = 0, 0.025, and 0.05) ceramics were investigated. Our microstructural analyses revealed that Ba2+ doping ions preferentially form in a secondary phase, and are not introduced into the CaCu3Ti4O12 lattice. Grain growth rate of CaCu3Ti4O12 ceramics was significantly inhibited by the Ba-related secondary phase particles, resulting in a large decrease in their mean grain size. The dielectric permittivity of CaCu3Ti4O12 ceramics decreased with increasing Ba content. Their loss tangent decreased after addition of CaCu3Ti4O12 with 2.5 mol% of Ba2+, and increased with increasing Ba contents to 5.0 mol%. The nonlinear coefficient and breakdown field of the Ca1−x Ba x Cu3Ti4O12 ceramics were significantly enhanced by adding 2.5 mol% of Ba2+, followed by a slight decrease as Ba2+ concentration was increased to 5.0 mol%. Using impedance spectroscopy analysis, it was revealed that variations in dielectric and non-Ohmic properties are associated with electrical response of grain boundaries. This supports the internal barrier layer capacitor model.

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Acknowledgments

This work was supported by the Integrated Nanotechnology Research Center (INRC), the Thailand Research Fund (TRF MRG5480045), the Commission on Higher Education (CHE), and Khon Kaen University, Thailand.

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Authors and Affiliations

  1. Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand

    Prasit Thongbai, Ekaphan Swatsitang & Vittaya Amornkitbamrung

  2. Integrated Nanotechnology Research Center (INRC), Khon Kaen University, Khon Kaen, 40002, Thailand

    Prasit Thongbai, Ekaphan Swatsitang & Vittaya Amornkitbamrung

  3. Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen, 40002, Thailand

    Somsack Vangchangyia

  4. National Metal and Materials Technology Center (MTEC), Thailand Science Park, Pathumthani, 12120, Thailand

    Teerapon Yamwong

  5. School of Physics, Institute of Science, Suranaree University, Nakhon Ratchasima, 30000, Thailand

    Santi Maensiri

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  1. Prasit Thongbai
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  2. Somsack Vangchangyia
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  3. Ekaphan Swatsitang
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  4. Vittaya Amornkitbamrung
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  5. Teerapon Yamwong
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  6. Santi Maensiri
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Correspondence to Prasit Thongbai.

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Thongbai, P., Vangchangyia, S., Swatsitang, E. et al. Non-Ohmic and dielectric properties of Ba-doped CaCu3Ti4O12 ceramics. J Mater Sci: Mater Electron 24, 875–883 (2013). https://doi.org/10.1007/s10854-012-0842-2

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  • DOI: https://doi.org/10.1007/s10854-012-0842-2

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