Microwave dielectric properties of (1 鈭?#xa0;x)Ca_0.6La_0.267TiO₃ 鈭?#xa0;xCa(Sm_0.5Nb_0.5)O₃ ceramics

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• 作者：Jiamao Li^a ; ^b ; ^{lijiamao@ahut.edu.cn} ; Tai Qiu^b ; ^{qiutai51@yahoo.cn}
• 关键词：Ca0.6La0.267TiO3 ; Ca(Sm0.5Nb0.5)O3 ; Microwave dielectric properties ; Microstructure
• 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：4331-4335
• 文件大小：619 K

摘要

Microstructures and microwave dielectric properties of (1 鈭?#xA0;x)Ca_0.6La_0.267TiO₃ 鈭?#xA0;xCa(Sm_0.5Nb_0.5)O₃ (0.1 鈮?#xA0;x 鈮?#xA0;0.7) ceramics have been investigated. A two-phase system was formed in the given compositional range. The grain morphology exhibited two different types of grain: large circular grain and small square grain. With the increasing x value, the grain morphology of the small square grain became irregular. The microwave dielectric properties were strongly related to the composition. As the x value increased from 0.1 to 0.7, the dielectric constant (蓻_r) decreased from 87 to 48.3, the quality factor (Q 脳 f) value from 14390 to 8360 GHz, and the temperature coefficient of resonant frequency (蟿_f) value from +130.6 to 鈭?4.8 ppm/掳C, respectively. For practical application, an 蓻_r of 74.3, a Q 脳 f value of 12690 GHz and a 蟿_f value of +8.8 ppm/掳C were obtained for 0.7Ca_0.6La_0.267TiO₃鈭?.3Ca(Sm_0.5Nb_0.5)O₃ ceramics sintered at 1450 掳C for 4 h.