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Research Article | Open Access

Low-temperature sintering and microwave dielectric properties of CaMg1-xLi2xSi2O6 (x = 0-0.3) ceramics

Fangyi HUANGaHua SUa,b( )Yuanxun LIa,bHuaiwu ZHANGaXiaoli TANGa
State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
Jiangxi Guo Chuang Industrial Park Development Co., Ltd., Ganzhou 341000, China
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Abstract

In this study, low-temperature fired CaMg1-xLi2xSi2O6 microwave dielectric ceramics were prepared via the traditional solid-state reaction method. In this process, 0.4 wt% Li2CO3-B2O3-SiO2- CaCO3-Al2O3 (LBSCA) glass was added as a sintering aid. The results showed that ceramics consisted of CaMgSi2O6 as the main phase. The second phases were CaSiO3 always existing and Li2SiO3 occurring at substitution content x > 0.05. Li+ substitution effectively lowered sintering temperature due to 0.4 wt% LBSCA and contributed to grain densification, and the most homogeneous morphology could be observed at x = 0.05. The effects of relative density, the second phase, and ionic polarizability on dielectric constant (εr) were investigated. The quality factor (Q × f ) varied with packing fraction that concerned the second phase. Moreover, the temperature coefficient of the resonant frequency (τf) was influenced by MgO6 octahedral distortion and bond valence. Excellent dielectric properties of the CaMg1-xLi2xSi2O6 ceramic was exhibited at x = 0.05 with εr = 7.44, Q × f = 41,017 GHz (f = 15.1638 GHz), and τf = −59.3 ppm/℃ when sintered at 900 ℃. It had a good application prospect in the field of low-temperature co-fired ceramic (LTCC) substrate and devices.

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Journal of Advanced Ceramics
Pages 471-480
Cite this article:
HUANG F, SU H, LI Y, et al. Low-temperature sintering and microwave dielectric properties of CaMg1-xLi2xSi2O6 (x = 0-0.3) ceramics. Journal of Advanced Ceramics, 2020, 9(4): 471-480. https://doi.org/10.1007/s40145-020-0390-9

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Received: 24 December 2019
Revised: 22 May 2020
Accepted: 22 May 2020
Published: 28 July 2020
© The Author(s) 2020

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