0.6Mg_4Nb_2O_9-0.4SrTiO_3复相陶瓷中温烧结和微波介电性能  

Middle-temperature Sintering and Dielectric Properties of 0.6Mg_4Nb_2O_9-0.4SrTiO_3 Composite Ceramics

作　　者：刘成[1] 王英[1] 马志军[1] 姚国光[2] 伊兰[1] 邵丽娟[1] 马玉景[1] 王照辉[1] 刘鹏[1] 

机构地区：[1]陕西师范大学物理学与信息技术学院,西安710062 [2]西安邮电学院理学院,西安710021

出　　处：《硅酸盐通报》2010年第5期1050-1054,共5页Bulletin of the Chinese Ceramic Society

基　　金：陕西师范大学勤助科研创新基金项目(QZZD10007);陕西师范大学实验室开放基金项目(No.09096);陕西师范大学中央高校基本科研业务费专项资金(2010ZYGX018);国家自然科学基金项目(No.50872078)

摘　　要：采用传统固相反应法制备了0.6Mg4Nb2O9-0.4SrTiO3复合陶瓷。研究了LiF掺杂对其烧结特性、显微组织和微波介电性能的影响。实验结果表明:通过添加一定量的LiF,可将Mg4Nb2O9/SrTiO3陶瓷的致密化烧结温度降至1100℃;其中掺杂1.5wt%LiF、1100℃下烧结5h的0.6Mg4Nb2O9-0.4SrTiO3陶瓷微波介电性能为:ε=20.6,Q·f=4057GHz;样品的微波介电性能与杂相Sr(Ti1-xNbx)O3+δ和残留液相有关。The 0.6Mg4Nb2O9-0.4SrTiO3 composite ceramics were prepared by the conventional solidstate reaction method.The effects of LiF addition on the sintering behavior,phase composition and microstructure of 0.6Mg4Nb2O9-0.4SrTiO3 specimen were studied.It was found that the densification sintering temperature of 0.6Mg4Nb2O9-0.4SrTiO3 ceramics was significantly lowered from 1300 ℃ to 1100 ℃ with a certain amount of LiF addition.The dielectric properties of the sample with 1.5wt% LiF sintered at 1100 ℃ for 5 h were：ε = 20.6,Q·f = 4057 GHz（at 8.2 GHz）.These properties were correlated with the formation of the second phase Sr（Ti1-xNbx） O3 ＋δ and remnant liquid phase.

关 键 词：复合陶瓷 X射线衍射 LiF掺杂 介电性能 

分 类 号：TM534[电气工程—电器]