添加La_2O_3对Mg_2TiO_4陶瓷的显微结构与微波介电性能的影响  

Effects of La_2O_3 Additions on Microstructure and Microwave Dielectric Properties of Mg_2TiO_4 Ceramics

作　　者：崔剑飞[1] 陈玮[1] 王乃刚[1] 张干城[1] 罗澜[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2003年第1期180-184,共5页Journal of Inorganic Materials

摘　　要：采用传统烧结工艺,制备了具有不同La2O3含量的镁钛镧陶瓷,并研究了La2O3组份对材料晶相构成、晶粒、晶界的演变、介电常数和品质因数的影响.结果表明,不含La2O3的钛酸镁陶瓷主晶相为Mg2TiO4,其平均晶粒尺寸>60μm;引入La2O3后,出现新晶相La0.66TiO2.99,材料的晶粒尺寸明显下降;随La2O3含量的增加,材料的介电常数线性增加,材料的品质因数Q在10GHz出现最大值(16558).(1-x)Mg2TiO4-xLa(2)O(3) ceramics were prepared corresponding to 0 less than or equal to x less than or equal to 0.1 by the conventional solid-state reaction methed. Their microstructures, dielectric properties were investigated. For the sample without La2O3, its average grain size was more than 60mum. With La2O3 added, the grain sizes became smaller and new crystal phase La0.66TiO2.99 appeared. In the meantime, dielectric constants of materials increased and the quality factor Q values can be up to 16558(10GHz) at x=0.03. Besides, microstructures of materials also changed obviously.

关 键 词：LA2O3 Mg2TiO4陶瓷 显微结构 微波材料 镁钛镧陶瓷 介电性能 

分 类 号：TQ174.756[化学工程—陶瓷工业]