钴掺杂对钛酸钡陶瓷晶体结构与电性能的影响(英文)  

INFLUENCE OF COBALT DOPING ON STRUCTURE AND ELECTRICAL PROPERTIES OF BARIUM TITANATE CERAMICS

作　　者：汪健[1] 王申存[1] 张鸿[1] 李志成[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《硅酸盐学报》2009年第3期354-358,共5页Journal of The Chinese Ceramic Society

基　　金：教育部留学回国人员科研启动基金(2006331,20071108);高校博士点专项科研基金(20070533119)资助项目

摘　　要：以湿化学合成方法制备了BaTi1-xCoxO3(x为Co的摩尔分数,x=0.01、0.03、0.05、0.1、0.2、0.3和0.4)陶瓷粉体,研究了Co含量对其晶体结构和电性能的影响。结果表明:随着Co含量的增加,材料在室温的晶相组成由四方相逐渐转变为四方与六方复合相。x=0.2时,晶相组成为纯六方相;x>0.2时,晶相转变为六方和立方混合相。材料的室温电阻相应逐渐减小,电阻温度关系从正温度系数(positive temperature coefficient,PTC)特征转变为负温度系数(negative temperature coefficient,NTC)特性。x=0.2、0.3和0.4时,材料的B常数分别为3270、3234K和3037K。用极化子跳跃模型解释了材料的NTC现象。BaTi1-xCoxO3(x is the mole fraction of Co,x=0.01,0.03,0.05,0.1,0.2,0.3,and 0.4) powders were prepared by a wet chemical process,and the influence of Co on the crystal structure and electrical properties were investigated.With the increase of Co concentration,the phase structure changes from tetragonal phase to tetragonal/hexagonal composite,and the ceramics are composed of pure hexagonal phase when x=0.2.The ceramics have a cubic phase besides the hexagonal one when x>0.2.The room-temperature resistance ...

关 键 词：钴掺杂钛酸钡陶瓷 晶体结构 电性能 负温度系数 导电机理 

分 类 号：TQ174.1[化学工程—陶瓷工业]