K_(0.5)Na_(0.5)NbO_3掺杂对BaTiO_3陶瓷介电性能的影响  

Effects of K_(0.5)Na_(0.5)NbO_3 Doping on Dielectric Properties of BaTiO_3 Ceramics

作　　者：孙乾坤[1] 陈国华[1,2] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004 [2]广西信息材料重点实验室,广西桂林541004

出　　处：《电工材料》2011年第4期32-35,39,共5页Electrical Engineering Materials

基　　金：广西研究生科研创新项目(2010105950805M39)

摘　　要：采用固相反应法制备了(K0.5Na0.5)NbO3_BaTiO3体系陶瓷。借助XRD、SEM和阻抗分析仪研究了掺杂(K0.5Na0.5)NbO3(简写为KNN)对陶瓷微结构及介电性能的影响。结果表明,掺杂KNN的陶瓷均呈单一的钙钛矿结构;掺杂KNN能促进陶瓷的烧结和提高陶瓷的致密度。BaTiO3陶瓷在高温端的电容变化率随KNN量的增加显著减小。陶瓷晶粒尺寸随KNN的增加(KNN掺杂量≤3 mol%)逐渐变小。掺杂3 mol%和5 mol%KNN的BaTiO3陶瓷满足EIA X7R特性。The （K0.sNa0.5）NbO3（KNN）-BaTiO3 system ceramics were prepared by the solid state reaction route. The effects of KNN doping on the microstructure and dielectric properties were investigated by means of X-ray diffraction （XRD）, scanning electron mic- roscope （SEM） and an impedance analyzer. The results showed that KNN-doped BaTiOs ceramics exhibited pure perovskite structure. Doping KNN could improve sintering densi- fication. The AC/C25°： values at high temperature obviously decreased with increasing KNN content. The grain size gradually decreased with increasing KNN content when KNN 43 mol%. BaTiO3 ceramics doped with 3 tool% and 5 tool% KNN are satisfied with the EIA XTR specification.

关 键 词：钛酸钡(BaTiO3) 铌酸钾钠((K0.5Na0.5)NbO3) X7R 多层陶瓷电容器(MLCC) 

分 类 号：TM534[电气工程—电器]