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Reaction sintering and mechanism of microwave dielectric ceramic with K2NiF4 structure and perovskite structure

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Abstract

We use reaction sintering method (RS) to prepared 0.85(1 − xCaTiO3−xLnAlO3)–0.15Ca1.15Ln0.85Al0.85Ti0.15O4 (Ln = Nd, Y) ceramics. CLnC ceramics have two phase structures of perovskite and K2NiF4. The ceramic grains are obvious solid solutions, and gradually enlarge with increasing the sintering temperature. CNdC ceramics exhibit good microwave dielectric properties in the sintering temperature range of 1475–1575 °C. As the sintering temperature increases from 1475 to 1500 °C, the density of CNdC ceramics tends to be stable, fluctuates around 4.6 g/cm3. The εr reaches maximum value at 1500 °C then gradually decreases. As the sintering temperature increases from 1500 to 1550 °C, the Q × f keeps a stable value from 41,953 to 44,188 GHz. As the sintering temperature was 1500 °C, the CNdC ceramics achieved the best microwave dielectric properties with εr = 37.15, Q × f = 44,188 GHz, τf = − 4 ppm/°C. The sintering temperature of CYC ceramics was relatively low and the ceramics sintered at 1450 °C achieved good microwave dielectric properties of εr = 38.3, Q × f = 29,620 GHz, τf = 0.03 ppm/excellent. It is worth noting that CYC ceramics have an excellent τf, which can ensure excellent temperature stability during application.

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Acknowledgements

This work was supported by Natural Science Foundation of China (Nos. 61761015 and 11664008), Natural Science Foundation of Guangxi (Nos. 2017GXNSFFA198011, 2018GXNSFFA050001 and 2017GXNSFDA198027) and High Level Innovation Team and Outstanding Scholar Program of Guangxi Institutes.

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Authors and Affiliations

  1. Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Key Laboratory of Nonferrous Materials and New Processing Technology, Ministry of Education, School of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, China

    Xi Wang, KaiYang Liu, Shicheng Zhou, Sen He, Shan Deng, YaQi Xiao, XiuLi Chen & Huanfu Zhou

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  1. Xi Wang
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  2. KaiYang Liu
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  3. Shicheng Zhou
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Wang, X., Liu, K., Zhou, S. et al. Reaction sintering and mechanism of microwave dielectric ceramic with K2NiF4 structure and perovskite structure. J Mater Sci: Mater Electron 33, 2213–2221 (2022). https://doi.org/10.1007/s10854-021-07429-6

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