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Sintering behavior and microwave dielectric properties of Sr2CeO4 ceramics doped with Li2CO3-Bi2O3

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Abstract

Microwave dielectric ceramics Sr2CeO4 + n wt% Li2CO3—Bi2O3 (LB) (1 ≤ n ≤ 4, L: B = x: y, weight ratio) were prepared by a traditional solid-state reaction method. The effects of LB additives on the phase formation, microstructure, sintering behavior, and microwave dielectric properties of Sr2CeO4 ceramics were investigated. The sintering temperature can be reduced obviously from 1270 to 950 °C because of the liquid phase formation of LB. Single-phase Sr2CeO4 ceramics with dense structure and homogenous grains were obtained by adding 1wt% LB. With LB content increasing, Q × f values would decrease because secondary-phase SrCeO3 appeared in the ceramics. When the content of LB was fixed at 1 wt%, the sintering temperature and Q × f value would decrease simultaneously with the ratio of Li2CO3 increasing. Desirable performances of Sr2CeO4 + 1wt% LB ceramics: (εr = 14.36, Q × f = 102,023 GHz and τf =  − 66.42 ppm/°C, L:B = 2:8) and (εr = 13.56, Q × f = 70,109 GHz, τf =  − 64.17 ppm/°C, L:B = 8:2) can be achieved at 1075 °C and 950 °C, respectively, suggesting that Sr2CeO4–LB ceramics have a great potential for millimeter-wave applications.

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Acknowledgements

The authors gratefully acknowledge the financial support from the Key R&D Program of Zhejiang Province (Grant No. 2020C01004).

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Authors and Affiliations

  1. School of Materials Science and Engineering, State Key Lab Silicon Mat, Zhejiang University, Hangzhou, 310027, People’s Republic of China

    Fuming Zhou, Hao Wang, Jianming Guo, Hui Yang & Qilong Zhang

  2. Dongyang First Magnetics Co Ltd, Dongyang, 322100, People’s Republic of China

    LingFeng Li

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  1. Fuming Zhou
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  2. Hao Wang
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Correspondence to Qilong Zhang.

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Zhou, F., Wang, H., Guo, J. et al. Sintering behavior and microwave dielectric properties of Sr2CeO4 ceramics doped with Li2CO3-Bi2O3. J Mater Sci: Mater Electron 31, 21693–21701 (2020). https://doi.org/10.1007/s10854-020-04682-z

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