微量La取代对(Ba_(0.9)Ca_(0.1))(Ti_(0.8)Zr_(0.2))O_3陶瓷介电性能的影响  

Effects of trace La substitution on microstructure and dielectric properties of(Ba_(0.9)Ca_(0.1))(Ti_(0.8)Zr_(0.2))O_3 ceramics

作　　者：李安琪[1] 王域[1] 杨柳[1] 杨平[1] 王瑞林[1] 

机构地区：[1]四川大学材料科学与工程学院,四川成都610065

出　　处：《电子元件与材料》2016年第4期1-3,共3页Electronic Components And Materials

基　　金：中物院-四川大学协同创新联合基金资助;四川省科技支撑计划资助(No.2013FZ0034)

摘　　要：采用传统固相法制备了(Ba_(0.9)Ca_(0.1))_(1–x)La_x(Ti_(0.8)Zr_(0.2))O_3(0≤x≤0.005)系列无铅陶瓷,并研究了微量La取代对锆钛酸钡钙陶瓷微观结构及介电性能的影响。X射线衍射和扫描电镜结果表明,La^(3+)进入锆钛酸钡钙晶格中形成均一的固溶体,并能有效抑制陶瓷颗粒的增长。介电性能测试结果显示,随着La^(3+)含量的增加,居里温度降低,室温介电常数先增大后减小,介电损耗则相反的趋势,取代后的样品介电频率稳定性增强。样品(Ba_(0.9)Ca_(0.1))_(0.997)La_(0.003)(Ti_(0.8)Zr_(0.2))O_3的综合介电性能最佳,在频率为1 k Hz时,室温介电常数可达18 592,而相应的介电损耗仅为0.013,居里温度为281 K。（Ba_（0.9）Ca_（0.1））_（1–x）La_x（Ti_（0.8）Zr_（0.2））O_3（0≤x≤0.005）lead-free ceramics were prepared by conventional solid-state method.The effects of La^3＋ substitution on the microstructure and dielectric properties of（Ba_（0.9）Ca_（0.1））（Ti_（0.8）Zr_（0.2））O_3 were studied.The results show that La^3＋ ion diffuses into the BCZT lattice and the grain growth is inhibited by La_2O_3 substitution.The Curie temperature shifts to lower temperature with the increases of La^3＋ concentration and the dielectric constant at room temperature increases firstly then decreases with further addition while the dielectric loss shows the reverse change trend.The frequency stability of dielectric constant is improved after La^（3＋ ）substitution.The optimum dielectric property is obtained by（Ba_（0.9）Ca_（0.1））_（0.997）La_（0.003）（Ti_（0.8）Zr_（0.2））O_3,with the dielectric constant of 18 592 at 1 k Hz at room temperature,the dielectric loss of only 0.013,and the Curie temperature of 281 K.

关 键 词：锆钛酸钡钙 镧取代 晶格结构 居里温度 频率稳定性 介电常数 

分 类 号：TM28[一般工业技术—材料科学与工程]