Microwave dielectric properties and compatibility with silver electrode of novel low-fired Ba₄CuTi₁₁O₂₇ ceramic

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• 作者：Nan Wang¹ ; Cong Liu¹ ; Yibin Wang ; Jingzhen Cheng ; Jianzhang Gong ; Huanfu Zhou ; ^{zhouhuanfu@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：LTCC ; Sintering ; Microstructure ; Dielectric properties
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：1 November 2016
• 年：2016
• 卷：42
• 期：14
• 页码：15855-15860
• 全文大小：1712 K

文摘

A novel low-fired microwave dielectric ceramic with composition of Ba₄CuTi₁₁O₂₇ was prepared by a conventional solid-state reaction method. A single-phase Ba₄CuTi₁₁O₂₇ ceramic could be well densified after sintering above 950 °C for 4 h in air. A refinement using X-ray powder diffraction data was carried out in the Rietveld method using the parameters of Ba₄Ti₁₂O₂₇ as a starting model. Ba₄CuTi₁₁O₂₇ ceramic sintered at 975 °C has a monoclinic structure (C12/m1) with lattice parameters of a=19.8061(4) Å, b=11.4456(2) Å, c=9.9131(2) Å, β=108.8988(15) Å, V=2126.08(8) Å³, Z=4. The Ba₄CuTi₁₁O₂₇ ceramics exhibited a low sintering temperature (~975 °C) and good microwave dielectric properties with Q×f value of 15,040 GHz, ε_r of 36.3 and τ_f value 11.9 ppm/°C. More importantly, the Ba₄CuTi₁₁O₂₇ dielectrics demonstrated good chemical compatibility with Ag when sintered at 950 °C, keeping excellent microwave dielectric properties with Q×f=12,130 GHz, ε_r=36.1, τ_f=12.1 ppm/°C, which indicates that Ba₄CuTi₁₁O₂₇ ceramic is a candidate for LTCC devices.