BiFeO_3-SrBi_2Nb_2O_9陶瓷的电导机制研究  

Study on the Electrical Conduction Mechanisms of BiFeO_3-SrBi_2Nb_2O_9 Ceramics

作　　者：黄海[1] 韩立波[1] 顾豪爽[2] 

机构地区：[1]长江大学物理科学与技术学院,湖北荆州424023 [2]湖北大学物理学与电子技术学院,湖北武汉430062

出　　处：《长江大学学报（自科版）（上旬）》2008年第4期49-51,共3页JOURNAL OF YANGTZE UNIVERSITY (NATURAL SCIENCE EDITION) SCI ＆ ENG

基　　金：国家自然科学基金项目(50272020);湖北省教育厅重大项目(Z200612001)

摘　　要：对单相层状结构的xBiFeO_3-SrBi_2Nb_2O_9(x=0、0.1)的铁电陶瓷进行交流阻抗分析,测试了样品的交流阻抗谱,确定了样品的等效电路,分析了不同温度下的晶粒和晶界的电导特性及其作用原理。结果表明,SBFN(x=0.1)在相同温度下的电导率明显低于SBN(x=0)的电导率。SBFN较SBN低温电导激活能下降,高温电导激活能升高,转变温度提高。A single-phase xBiFeO3-(1-x)SrBi2Nb2O9(x=0、0.1)ferroelectric ceramics of layered perovskite structure was synthesized by conventional solid state reaction.The impedance analysis indicates the conductivity of SBFN was lower than that of SBN at the same temperature.The activation energy at the low temperature of SBFN is lower than SBN,while the activation energy at the high temperature of SBFN is higher than SBN,the transition temperature goes up.

关 键 词：xBiFeO3^-(1-x)SrBi2Nb2O9陶瓷 阻抗谱 电导率 激活能 

分 类 号：O482.4[理学—固体物理] TB303[理学—物理]