A novel low-firing microwave dielectric ceramic Li₂ZnGe₃O₈ with cubic spinel structure

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• 作者：Huaicheng Xiang^a ; Liang Fang^a ; ^b ; ^{fanglianggl001@aliyun.com" class="auth_mail" title="E-mail the corresponding author} ; Weishuang Fang^a ; Ying Tang^a ; ^b ; Chunchun Li^a ; ^c ; ^{lichunchun2003@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Microwave dielectric properties ; LTCC ; Spinel structure ; Li2ZnGe3O8
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：625-629
• 全文大小：1152 K

文摘

A Li₂ZnGe₃O₈ ceramic was investigated as a promising microwave dielectric material for low-temperature co-fired ceramics applications. Li₂ZnGe₃O₈ ceramic was prepared via the conventional solid-state method. X-ray diffraction data shows that Li₂ZnGe₃O₈ ceramic crystallized into a cubic spinel structure with a space group of P4₁32. Dense ceramic with a relative densities of 96.3% were obtained when sintered at 945 °C for 4 h and exhibited the optimum microwave properties with a relative permittivity (ε_r) of 10.3, a quality factor (Q × f) of 47,400 GHz (at 13.3 GHz), and a temperature coefficient of resonance frequency (τ_f) of −63.9 ppm/°C. The large negative τ_f of Li₂ZnGe₃O₈ ceramic could be compensated by rutile TiO₂, and 0.9Li₂ZnGe₃O₈–0.1TiO₂0·1TiO₂ ceramic sintered at 950 °C for 4 h exhibited improved microwave dielectric properties with a near-zero τ_f of −1.6 ppm/°C along with ε_r of 11.3 and a Q × f of 35,800 GHz (11.6 GHz). Moreover, Li₂ZnGe₃O₈ was found to be chemically compatible with silver electrode when sintered at 945 °C.