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Dielectric relaxation investigations in barium strontium titanate glass-ceramics: Thermally stimulated depolarization current technique

Authors

  • Zhenlei Zhao,

    1. Beijing Key Laboratory of Fine Ceramics, State Key Laboratory of New Ceramics and Fine Processing, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, P. R. China
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  • Yong Zhang,

    Corresponding author
    1. Beijing Key Laboratory of Fine Ceramics, State Key Laboratory of New Ceramics and Fine Processing, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, P. R. China
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  • Qian Zhang,

    1. Beijing Key Laboratory of Fine Ceramics, State Key Laboratory of New Ceramics and Fine Processing, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, P. R. China
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  • Xiaozhen Song,

    1. Beijing Key Laboratory of Fine Ceramics, State Key Laboratory of New Ceramics and Fine Processing, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, P. R. China
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  • Jia Zhu,

    1. Beijing Key Laboratory of Fine Ceramics, State Key Laboratory of New Ceramics and Fine Processing, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, P. R. China
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  • Xiangrong Wang,

    1. Beijing Key Laboratory of Fine Ceramics, State Key Laboratory of New Ceramics and Fine Processing, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, P. R. China
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  • Zhiqin Zheng

    1. Beijing Key Laboratory of Fine Ceramics, State Key Laboratory of New Ceramics and Fine Processing, Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing, P. R. China
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Abstract

Different dielectric relaxation processes in barium strontium titanate glass-ceramics have been investigated using the thermally stimulated depolarization current (TSDC) technique. The TSDC results obtained from the glass-ceramics polarized under various polarization conditions show the presence of two peaks designated as A and B in ascending order of temperature, respectively. The peak A is determined to be of dipole origin and assumed to be associated with a defect complex. In addition, the peak B is due to space-charge polarization arising from the interface between the crystalline phases and the glass matrix. It is supposed to be associated with the relaxation of oxygen vacancies. The TSDC characteristics demonstrate that the degree of crystallinity in glass-ceramics is a predominant factor in deciding the features of dielectric relaxation mechanisms.pssa201431119-gra-0001

TSDC plots for the BST glass-ceramic samples sintered at various temperatures with the same polarization conditions.

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