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Novel Series of Low-Firing Microwave Dielectric Ceramics: Ca5A4(VO4)6 (A2+ = Mg, Zn)

Authors

  • Guo-guang Yao,

    1. College of Physics and Information Technology, Shaanxi Normal University, Xi'an, China
    2. School of Science, Xi'an University of Posts and Telecommunications, Xi'an, China
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  • Peng Liu,

    Corresponding author
    • College of Physics and Information Technology, Shaanxi Normal University, Xi'an, China
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  • Huai-wu Zhang

    1. The Key Laboratory of Electronic Thin Film and Integrated Device, University of Electronic Science and Technology of China, Chengdu, China
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Author to whom correspondence should be addressed. e-mail: liupeng@snnu.edu.cn

Abstract

Using a conventional solid-state reaction Ca5A4(VO4)6 (A2+ = Mg, Zn) ceramics were prepared and their microwave dielectric properties were investigated for the first time. X-ray diffraction revealed the formation of pure-phase ceramics with a cubic garnet structure for both samples. Two promising ceramics Ca5Zn4(VO4)6 and Ca5Mg4(VO4)6 sintered at 725°C and 800°C were found to possess good microwave dielectric properties: εr = 11.7 and 9.2, Q × f = 49 400 GHz (at 9.7 GHz) and 53 300 GHz (at 10.6 GHz), and τf = −83 and −50 ppm/°C, respectively.

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