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Microstructure and microwave dielectric properties of Ba([Mg1−xZnx]1/3Ta2/3)O3 solid solution ceramics

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Abstract

The phase structure, microstructure and microwave dielectric properties of Ba([Mg1−xZnx]1/3Ta2/3)O3 (BMZT, 0 ≤ x ≤ 0.25) ceramics were researched as a function of ZnO  addition by the traditional solid-state ceramic route. X-ray diffraction (XRD) analysis showed that there were two phases: main crystalline phase Ba(Mg1/3Ta2/3)O3 (BMT) and secondary phase Ba0.5TaO3. SEM photograph indicated that ZnO working as a sintering aid promoted the grain growth and densification. As increasing x from 0 to 0.25, the dielectric constant (εr) increased continuously from 23.7 to 25.9, and the Q × f value initially increased from 62,300 GHz to the peak value of 158,900 GHz (x = 0.2) and declined to 96,500 GHz thereafter. Meanwhile, the temperature coefficient of resonant frequency (τf) initially declined to 0.15 ppm/°C (x = 0.2) and then increased to 2.9 ppm/°C. Ceramics with superior microwave dielectric properties: εr = 25.7, Q × f = 158,900 GHz (f = 8 GHz) and τf = 0.15 ppm/°C were obtained at x = 0.2.

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Acknowledgements

This work was supported by the scientific Research Fund of Hunan Provincial Education Department (Grant No. 18B428).

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Authors and Affiliations

  1. Provincial Key Laboratory of Informational Service for Rural Area of Southwestern Hunan, Shaoyang University, Shaoyang, 422000, China

    Sen Peng & Jianming Xu

  2. College of Electrical and Information Engineering, Hunan University, Changsha, 410082, China

    Hao Li

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  1. Sen Peng
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  2. Jianming Xu
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  3. Hao Li
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Correspondence to Sen Peng.

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Peng, S., Xu, J. & Li, H. Microstructure and microwave dielectric properties of Ba([Mg1−xZnx]1/3Ta2/3)O3 solid solution ceramics. J Mater Sci: Mater Electron 31, 20423–20430 (2020). https://doi.org/10.1007/s10854-020-04561-7

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