Microstructure and microwave dielectric properties of (1 鈭?#xa0;x)Ca_0.6La_0.267TiO₃-xCa(Mg_1/3Nb_2/3)O₃ ceramics

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• 作者：Peng Xu ^{a32166467@163.com.cn} ; Jian Yang ; Jiamao Li ; Tai Qiu ; ^{qiutai@njut.edu.cn}
• 关键词：C. Dielectric properties ; (1  ; &minus ;   ; x)Ca0.6La0.267TiO3&ndash ; xCa(Mg1/3Nb2/3)O3 ; Complex perovskite ; Ceramics
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：3863-3867
• 文件大小：920 K

摘要

(1 鈭?#xA0;x)Ca_0.6La_0.267TiO₃-xCa(Mg_1/3Nb_2/3)O₃ ceramics were prepared by a conventional solid-state ceramic route. The microstructure and microwave dielectric properties were investigated as a function of composition and sintering temperature. As the content of Ca(Mg_1/3Nb_2/3)O₃ increased, the temperature coefficient of resonant frequency (蟿_f) value decreased gradually. By appropriately adjusting the x value in the present ceramic system, a near-zero 蟿_f value could be achieved. The appropriate increase of sintering temperature could significantly improve Q路f value by influencing the grain growth. The optimal microwave dielectric properties with a dielectric constant (蓻_r) of 52.4, Q路f of 36,428 GHz (at 5.8 GHz), and 蟿_f of 3.4 ppm/掳C were obtained for the specimen 0.5Ca_0.6La_0.267TiO₃-0.5Ca(Mg_1/3Nb_2/3)O₃ sintered at 1490 掳C for 4 h.