(1-x)BaTiO_3-xBi_(0.5)Na_(0.5)TiO_3陶瓷的微结构与介电性能研究  

MICROSTRUCTURE AND DIELECTRIC PROPERTIES OF (1-x)BaTiO_3-x Bi_(0.5)Na_(0.5)TiO_3 CERAMICS

作　　者：高兰芳[1] 黄焱球[1] 刘春凤[1] 周飞[1] 宛新武[1] 刘甜甜[1] 

机构地区：[1]中国地质大学材料科学与化学工程学院,武汉430074

出　　处：《中国陶瓷》2008年第4期18-20,31,共4页China Ceramics

基　　金：中国地质大学研究生学术探索与创新基金资助项目(编号:CUGYJS0703)

摘　　要：采用传统电子陶瓷制备工艺制备了(1x)BaTiO3-xBi0.5Na0.5TiO3(x=0.2～0.6)陶瓷,研究了不同Bi0.5Na0.5TiO3(BNT)含量下陶瓷的微结构特征和介电性能结果表明:在BNT为0.2～0.6mol时,陶瓷样品均具有单一的钙钛矿结构,陶瓷的晶粒形状和大小随BNT含量的增加发生变化,BNT含量增加时样品的晶粒趋于减小,样品结构更为致密。陶瓷样品都具有稳定的介电性能,较高的介电常数,较低的介电损耗,BT-BNT40的介电稳定性最好居里温度随BNT含量的增加而升高,当BNT含量为0.6mol时Tc=210℃。The （1-x）BaTiO3-xBi0.5Na0.5TiO3 ceramics were prepared by the conventional ceramic technique. The microstructure and dielectric properties of the ceramics with different content of Bi0.5Na0.5TiO3 （BNT） were studied. The results indicated that all the ceramics with 0.2- 0.6mol BNT were of pure perovskite structure, and the size and the shape of grains changed obviously with the increase of BNT content. The grain size became smaller and the ceramics became more compact when BNT content increased. All the ceramics show temperaturestable dielectric characteristics, and the relatively high permittivity and low dielectric losses as well. The BTBNT40 ceramics shows outstanding dielectric stability. The Curie temperature shifted to high temperature as BNT increased, and the highest Curie temperature, 210℃ , was obtained when BNT content is 0.6mol.

关 键 词：(1-x)BaTiO3-xBi0.5Na0.5TiO3陶瓷 微结构 介电性能 

分 类 号：TQ174.7[化学工程—陶瓷工业] TQ174.758[化学工程—硅酸盐工业]