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Journal of Materials Science: Materials in Electronics
Published in: Journal of Materials Science: Materials in Electronics 16/2020

06-07-2020

Phase evolution and microwave dielectric properties of the Li2(1+x)ZnGe3O8 spinel oxides

Authors: Weishuang Fang, Laiyuan Ao, Ying Tang, Jie Li, Huaicheng Xiang, Zhiwei Zhang, Qianbiao Du, Liang Fang

Published in: Journal of Materials Science: Materials in Electronics | Issue 16/2020

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Abstract

Recently, there have been considerable interests in the Li-containing spinel oxides as promising microwave dielectric materials. Li loss at elevated temperatures, however, is known to be inevitable, resulting in deterioration on dielectric performances. Here the influence of Li nonstoichiometry on the microwave dielectric properties of Li2ZnGe3O8, a spinel oxide, was reported. An appropriate level of Li excess enhanced the densification of Li2ZnGe3O8 and increased dielectric performances. In contrast, high level of Li excess induced the formation of the secondary phase of Li2ZnGeO4 confirmed by XRD and Raman spectra, which in turn lowered the dielectric properties. Typically, a composition with x = 0.075, in the Li2(1+x)ZnGe3O8 ceramics exhibited the enhanced microwave dielectric properties with εr = 10.68, Q × f = 77,300 GHz (at 13.3 GHz), and τf = − 70.35 ppm/°C when sintered at 940 °C for 4 h. Moreover, these compounds have well chemical compatibility with the silver electrodes.
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Metadata
Title
Phase evolution and microwave dielectric properties of the Li2(1+x)ZnGe3O8 spinel oxides
Authors
Weishuang Fang
Laiyuan Ao
Ying Tang
Jie Li
Huaicheng Xiang
Zhiwei Zhang
Qianbiao Du
Liang Fang
Publication date
06-07-2020
Publisher
Springer US
Published in
Journal of Materials Science: Materials in Electronics / Issue 16/2020
Print ISSN: 0957-4522
Electronic ISSN: 1573-482X
DOI
https://doi.org/10.1007/s10854-020-03904-8

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