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Effects of BaCu(B2O5) Addition on Phase Transition, Sintering Temperature, and Microwave Properties of Ba4LiNb3O12 Ceramics

Authors

  • Liang Fang,

    Corresponding author
    1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Guilin University of Technology, Guilin 541004, China
    2. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China
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  • Dongjin Chu,

    1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Guilin University of Technology, Guilin 541004, China
    2. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China
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  • Chunchun Li,

    1. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China
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  • Huanfu Zhou,

    1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Guilin University of Technology, Guilin 541004, China
    2. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China
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  • Zhao Yang

    1. State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Guilin University of Technology, Guilin 541004, China
    2. Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, Guilin University of Technology, Guilin 541004, China
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  • N. Alford—contributing editor

  • This work was supported by Natural Science Foundation of China (No. 50962004 and 50762002), Natural Science Foundation of Guangxi (No. 0832003Z and No. 0832001), and Programs for New Century Excellent Talents in Guangxi (No. 2006202).

†Author to whom correspondence should be addressed. e-mail: fangliangskl@yahoo.com.cn

Abstract

Polycrystalline sample of Ba4LiNb3O12 is synthesized in the temperature range of 1150°–1180°C by the conventional solid-state reaction method. A phase transition from cubic to hexagonal perovskite is observed around 1160°C. It is noted that hexagonal phase of Ba4LiNb3O12 obtained at 1180°C could be stabilized at a considerably lower temperature (∼950°C) with BaCu(B2O5) (BCB) added. BCB addition effectively improves the densification of Ba4LiNb3O12 ceramic and significantly affects the microwave dielectric properties. When 4 wt% BCB is added, a dense ceramic can be sintered at 950°C with a ɛr of 34.5, a high Q×f of 29 600 GHz, and a low τf of 12.4 ppm/°C. Moreover, BCB-added Ba4LiNb3O12 ceramics have a chemical compatibility with silver.

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