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 the 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：《电子元件与材料》2011年第8期1-4,共4页Electronic Components And Materials

基　　金：广西研究生科研创新资助项目(No.2010105950805M39)

摘　　要：采用固相反应法制备了(K0.5Na0.5)NbO3(KNN)-BaTiO3陶瓷。借助XRD、SEM和阻抗分析仪研究了KNN掺杂对BaTiO3陶瓷微观结构及介电性能的影响。结果表明:掺杂KNN的BaTiO3陶瓷均呈现出单一钙钛矿结构。KNN掺杂能够促进BaTiO3陶瓷的烧结并提高其致密度。随KNN掺杂量(摩尔分数)的增加,BaTiO3陶瓷的晶粒尺寸逐渐变小(x(KNN)≤3%),而其在高温端的电容变化率则显著减小。KNN掺杂量为3%～5%的BaTiO3陶瓷均符合EIA X7R标准。（K0.5Na0.5） NbO3（KNN）-BaTiO3 ceramics were prepared by the solid state reaction method.The effects of KNN doping on the microstructure and dielectric properties of BaTiO3 ceramics were investigated by X-ray diffractometer（XRD）,scanning electron microscope（SEM） and an impedance analyzer.The results show that all KNN-doped BaTiO3 ceramics exhibit pure perovskite structure.KNN doping promotes the sintering and increases the density of BaTiO3 ceramics.With the increase of KNN content（mole fraction）,the grain size of BaTiO3 ceramics decreases gradually（x（KNN）≤3%）,while the capacitance variation rate of BaTiO3 ceramics at high temperature decreases significantly.BaTiO3 ceramics doped with 3% to 5% KNN both completely fulfill the requirements of the EIA X7R specification.

关 键 词：多层陶瓷电容器 X7R 钛酸钡 铌酸钾钠 

分 类 号：TM534[电气工程—电器]