Ba_(0.98)Bi_(0.02)(Ti_(0.9)Zr_(0.1))_(1-x)Co_xO_3陶瓷的介电性能及弛豫特性研究  

The Dielectric Properties and Relaxor Behaviour of Ba Ba_(0.98)Bi_(0.02)(Ti_(0.9)Zr_(0.1))_(1-x)Co_xO_3 Ceramics

作　　者：曾卓玮[1] 丁士华[1] 宋天秀[1] 张倩[1] 钟祥清[1] 

机构地区：[1]西华大学材料科学与工程学院,四川成都610039

出　　处：《西华大学学报（自然科学版）》2014年第2期7-10,26,共5页Journal of Xihua University:Natural Science Edition

基　　金：国家自然科学基金(11074203);西华大学研究生创新基金(YCJJ201303;YCJJ201306)

摘　　要：采用固相反应法通过施受主共掺的方式制备Ba0.98Bi0.02(Ti0.9Zr0.1)1-xCoxO3(x=0.005,0.01,0.015,0.02)陶瓷,通过XRD和LCR表征样品的相结构和介电性能。结果表明:在所掺杂溶度范围内,陶瓷样品未出现第二相;x=0.02时样品仅表现出弥散相变铁电体的特征,晶体中缺陷偶极子以[Bi·Ba-Co'Ti/Zr]为主,晶体中缺陷偶极子的存在形式与介电弛豫程度相关;样品结晶化学特性说明B位离子键价与其介电常数存在反比例关系。Ba0.98Bi0.02（Ti0.9Zr0.1）1-xCoxO3（x=0.00,0.005,0.015,0.02）ceramics were prepared by a solid phase reaction .The microstructure and dielectric properties of the ceramics were investigated by XRD and LCR .The results showed that the second phase didn’t occur in doping range;when x=0.02, the ceramic was diffuse ferroelectrics .The dominant defect dipoles was [2Bi＆#183;Ba-Vo″], [Bi＆#183;Ba -Co′Ti/Zr] in crystal.The varieties of defect dipoles made a significant influence on dielectric relaxion .According to crystal chemistry results,it was concluded that the bond valance sum was inversely proportional to the dielectric constants .

关 键 词：BA0 98Bi0 02(Ti0 9Zr0 1)1-xCoxO3 陶瓷 介电弛豫 缺陷偶极子 

分 类 号：TM22[一般工业技术—材料科学与工程]