BiFeO_3掺杂对CaCu_3Ti_4O_(12)陶瓷结构和介电性能的影响  

Effects of BiFeO_3 doping on the structure and dielectric properties of CaCu_3Ti_4O_(12) ceramics

作　　者：郑兴华[1] 刘馨[1] 汤德平[1] 刘旭俐[1] 郑可炉[2] 

机构地区：[1]福州大学材料科学与工程学院,福建福州350108 [2]福州大学物理与信息工程学院,福建福州350108

出　　处：《电子元件与材料》2010年第3期8-11,共4页Electronic Components And Materials

基　　金：福建省高等学校新世纪优秀人才支持计划资助项目(NoXSJRC2007-16);福建省属高校资助项目(No2007F5002);福州大学发展基金资助项目(No2007-XQ-01)

摘　　要：采用固相反应法制备了BiFeO3掺杂的CaCu3Ti4O12(CCTO)陶瓷,研究了BiFeO3掺杂量对CCTO陶瓷的烧结性能、晶体结构和介电性能的影响。结果表明,BiFeO3掺杂改善了CCTO陶瓷的烧结性能。随BiFeO3掺杂量的增加,CCTO陶瓷的晶格常数和εr均先增大而后减小;而tanδ先几乎不变而后增大。当x(BiFeO3)为0.5%,1040℃烧结的CCTO陶瓷样品在1kHz时具有巨介电常数(εr=14559)和较低的介质损耗(tanδ=0.12)。BiFeO3 doped CaCu3Ti4O12（CCTO） ceramics were prepared using the solid state reaction method.The effects of BiFeO3 doping amount on the sintering characteristic,crystal structure and dielectric properties of CCTO ceramics were investigated.The results show that the sintering characteristic of CCTO ceramics is improved by BiFeO3 doping.With the increase of BiFeO3 doping amount,the lattice constants and relative permittivity of CCTO ceramics increase at first,then gradually decrease.However,dielectric loss changes little first,and then increases while the BiFeO3 doping amount increases.With the 0.5%（mole fraction） BiFeO3 doping,the CCTO ceramic sample sintered at 1 040℃ possesses giant permittivity（εr=14559） and low dielectric loss（tanδ=0.12） at 1 kHz.

关 键 词：CACU3TI4O12 BIFEO3 巨介电常数 固相反应法 

分 类 号：TM34[电气工程—电机]