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Structure and Dielectric Properties of Re0.02Sr0.97TiO3 (Re La, Sm, Gd, Er) Ceramics for High-Voltage Capacitor Applications

Authors

  • Zong-Yang Shen,

    Corresponding author
    1. Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania
    • School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen, China
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  • Qi-Guo Hu,

    1. School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen, China
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  • Yue-Ming Li,

    Corresponding author
    • School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen, China
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  • Zhu-Mei Wang,

    1. School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen, China
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  • Wen-Qin Luo,

    1. School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen, China
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  • Yan Hong,

    1. School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen, China
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  • Zhi-Xiang Xie,

    1. School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen, China
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  • Run-Hua Liao

    1. School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen, China
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Author to whom correspondence should be addressed. e-mails: shenzongyang@gmail.com, lym6329@yahoo.com.cn

Abstract

Rare–earth-doped strontium titanate ceramics yielding the formula Re0.02Sr0.97TiO3 (Re–ST, Re = La, Sm, Gd, Er) were prepared by solid-state reaction route. All Re–ST ceramics had single cubic perovskite structure similar to pure SrTiO3 (ST). The grain size of Re–ST ceramics dramatically decreased to 1–10 μm, depending on different rare-earth elements, as compared to ~30 μm of pure ST. The relative dielectric constant of Re–ST ceramics (εr = 2750–4530 at 1 kHz) showed about 10–15 times higher than that of pure ST (εr = 300 at 1 kHz), whereas the dielectric loss of Re–ST ceramics still remained lower than 0.03 (at 1 kHz) at room temperature. Under 0–1.63 × 106 V/m bias electric field testing conditions, the εr of Re–ST ceramics at room temperature changed within 14%. The PE results indicated that the Re–ST ceramics were linear dielectrics. Together with their relatively high breakdown strength (Eb > 1.4 × 107 V/m), the Re–ST ceramics could be very promising for high-voltage capacitor applications. Meanwhile, the temperature stability of the εr of Re–ST ceramics was evaluated in a temperature range of −60°C–200°C.

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