Low temperature sintering and microwave dielectric properties of Ba₂Ti₃Nb₄O₁₈ ceramics for LTCC applications

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• 作者：Dong Zou ; Qilong Zhang ; Hui Yang ; Shaochun Li
• 关键词：Dielectric properties ; Sintering ; LTCC ; Ba₂Ti₃Nb₄O₁₈
• 刊名：Journal of the European Ceramic Society
• 出版年：2008
• 出版时间：October 2008
• 年：2008
• 卷：28
• 期：14
• 页码：2777-2782
• 全文大小：1016 K

文摘

The effects of MnCO₃–CuO and Li₂O–B₂O₃–SiO₂ (for short LBS) on the sintering behavior, microstructures and microwave dielectric properties of Ba₂Ti₃Nb₄O₁₈ ceramics have been investigated. The pure Ba₂Ti₃Nb₄O₁₈ ceramics sintered at 1220 °C showed microwave dielectric properties: _r = 38, Q × f = 23,700 GHz (at 4.8 GHz), and τ_f = −3 ppm/°C. It was found that a small amount of MnCO₃–CuO and LBS glass additives lowered the sintering temperature of Ba₂Ti₃Nb₄O₁₈ ceramics effectively from 1220 °C to 900 °C. The dielectric constant (_r) increased and the temperature coefficient of the resonant frequency shifted to a positive value with the addition of MnCO₃–CuO and LBS, which were mainly due to the presence of the second phase Ba₃Ti₄Nb₄O₂₁. Ba₂Ti₃Nb₄O₁₈ ceramics with 1.5 wt % MnCO₃–CuO and 0.5 wt % LBS sintered at 900 °C for 2 h showed dielectric properties: _r = 41, Q × f = 15,000 GHz (at 4.8 GHz), and τ_f = 4 ppm/°C. It was compatible with Ag electrodes, which made it a promising ceramic for low temperature co-fired ceramics technology application.