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Structure, Dielectric Properties and Temperature Stability of BaTiO3–Bi(Mg1/2Ti1/2)O3 Perovskite Solid Solutions

Authors

  • Bo Xiong,

    1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
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  • Hua Hao,

    Corresponding author
    1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
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  • Shujun Zhang,

    1. Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
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  • Hanxing Liu,

    Corresponding author
    1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
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  • Minghe Cao

    1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Material Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
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  • X. Tan—contributing editor

  • This work was supported by the Key program of Natural Science Foundation of China (No. 50932004), Natural Science Foundation of China (No.50872102), the Fundamental Research Funds for the Central Universities and the Key Grant Project of Chinese Ministry of Education (No.309022).

†Author to whom correspondence should be addressed. e-mail: haohua@whut.edu.cn and lhxhp@whut.edu.cn

Abstract

(1−x)BaTiO3xBi(Mg1/2Ti1/2)O3 [(1−x)BT–xBMT] polycrystalline ceramics were obtained via solid-state processing techniques. The solubility limit for (1−x)BT–xBMT was determined to be about x=0.07. A systematic structural change from the ferroelectric tetragonal phase to pseudocubic phase was observed at about x≥0.05 at room temperature. Dielectric measurements revealed a gradual change from normal ferroelectric of pure BaTiO3 to highly dispersive relaxor-like characteristics in the solid solution with 30–60 mol% Bi(Mg1/2Ti1/2)O3, showing low-temperature coefficients of capacitance over a wide temperature range. The properties of Nb2O5-doped 0.85BT–0.15BMT ceramics were investigated to better understand the formation mechanism of core-shell structure, for further improving the temperature stability of the dielectric behavior.

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