Ba5Li2W3O15: A New Li-Containing Perovskite-Type Microwave Ceramic with High Q and Low τf

Authors

  • Liang Fang,

    Corresponding author
    1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, College of Material Science and Engineering, Guilin University of Technology, Guilin, China
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  • Zhenhai Wei,

    1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, College of Material Science and Engineering, Guilin University of Technology, Guilin, China
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  • Wei Liao,

    1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, College of Material Science and Engineering, Guilin University of Technology, Guilin, China
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  • Huanfu Zhou,

    1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, College of Material Science and Engineering, Guilin University of Technology, Guilin, China
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  • Hui Zhang,

    1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, College of Material Science and Engineering, Guilin University of Technology, Guilin, China
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  • Fei Xiang

    1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, College of Material Science and Engineering, Guilin University of Technology, Guilin, China
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Abstract

A new Li-containing microwave ceramic Ba5Li2W3O15 with hexagonal perovskite structure was prepared through a solid-state ceramic route. Small amount of scheelite BaWO4 appeared as a second phase during sintering. The Ba5Li2W3O15 could be well densified at 1120°C and exhibits good microwave dielectric properties with permittivity (εr) of 25.4, high Q × f value about 39 000 GHz, and low temperature coefficient of resonate frequency (τf) of 10 ppm/°C. The addition of BaCu(B2O5) can effectively lower the sintering temperature from 1120°C to 900°C and does not induce degradation of the microwave dielectric properties. These results indicate that the Ba5Li2W3O15 ceramic might be a promising candidate in microwave dielectric resonators.

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