Microstructures and microwave dielectric properties of Ba₄LiNb₃O₁₂-BaWO₄ composite ceramics

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• 作者：Cailan Tian ; Zhenxing Yue ; ^{yuezhx@tsinghua.edu.cn} ; Yuanyuan Zhou
• 关键词：Composite ; Mixture ; Sintering ; Dielectric properties ; Perovskite
• 刊名：Materials Science and Engineering: B
• 出版年：2013
• 出版时间：1 February, 2013
• 年：2013
• 卷：178
• 期：2
• 页码：178-182
• 全文大小：1867 K

文摘

Composite ceramics of (1 ? x)Ba₄LiNb₃O₁₂-xBaWO₄ (x = 0.36-0.69) had been synthesized by co-firing the mixtures of Ba₄LiNb₃O₁₂ and BaWO₄ powders. The structures and microwave dielectric properties of the ceramics were studied by XRD, SEM, and TEM. These ceramics consisted of hexagonal Ba₄LiNb₃O₁₂ and tetragonal BaWO₄. The two phases co-existed well in the ceramics, and there was not obvious reaction at interfacial areas among grains. These ceramics had low sintering temperatures and excellent microwave dielectric properties, especially the small temperature coefficients of resonant frequency (¦Ó_f) and high quality factor (Q ¡Á f) values. For composition at x = 0.69, the ceramic sintered at 1070 ¡ãC had Q ¡Á f value of 75,500 GHz and ¦Ó_f value of +8.7 ppm/¡ãC.