固相合成微波介电陶瓷Ba_2La_2Ti_2NbO_(12)及介电特性研究  

Dielectric Properties of The Microwave Dielectric Ceramic Ba_2La_2Ti_2NbO_(12) Prepared by Solid-State Synthesis

作　　者：刘红飞[1] 杨海霞[2] 

机构地区：[1]宁夏大学物理电气信息学院,银川750021 [2]中国矿业大学银川学院土木工程系,银川750021

出　　处：《山东陶瓷》2013年第6期18-20,共3页Shandong Ceramics

摘　　要：通过固相反应法合成了类钙钛矿结构新铌酸盐Ba2La2Ti2NbO12。分别采用X射线衍射分析、扫描电镜进行了结构分析,并进行了介电性能测试。结果表明:Ba2La2Ti2NbO12室温时为六方层状类钙钛矿结构,有优异的介电性能。晶胞常数为:a=b=5.6726(3),c=27.740(2),V=773.04(9)3,Z=3,陶瓷体具有高的介电常数42.7,较高的品质因子31,130GHz,介电常数温度系数-4.2ppmoC-1。The microwave dielectric ceramic Ba2La2 Ti2NbO12 was prepared by solid--state synthesis. The compound crystallizes in the hexagonal system with unit cell parameter a=b=5. 6726（3）A, c=27.740（2） A, V=773.04（9）A3 and Z=3. It shows that Ba2La2Ti2NbO12 is hexagonal perovskite structure and have superior properties. The microwave dielectric properties of the ceramic were stud- ied using a network analyzer, and it shows that ceramic hasa high dielectric constant of 42.7, a high quality factors with Q;~ f of 31,130 GHz, and a small negative τf of -4.2 ppm°C-1.

关 键 词：X射线衍射分析 品质因子 介电常数 

分 类 号：TQ174.6[化学工程—陶瓷工业]