| 钴掺杂对钛酸钡陶瓷晶体结构与电性能的影响(英文) |
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| 引用本文： | 汪健,王申存,张鸿,李志成.钴掺杂对钛酸钡陶瓷晶体结构与电性能的影响(英文)[J].硅酸盐学报,2009,37(3). |
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| 作者姓名： | 汪健 王申存 张鸿 李志成 |
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| 作者单位： | 中南大学材料科学与工程学院,长沙,410083 |
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| 基金项目： | 教育部留学回国人员科研启动基金，高等学校博士学科点专项科研基金 |
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| 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(ncgalive temperature coefficient,NTC)特性.x=0.2、0.3和0.4时,材料的B常数分别为3 270、3 234 K和3 037 K.用极化子跳跃模型解释了材料的NTC现象.
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| 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 |
INFLUENCE OF COBALT DOPING ON STRUCTURE AND ELECTRICAL PROPERTIES OF BARIUM TITANATE CERAMICS |
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| WANG Jian,WANG Shencun,ZHANG Hong,LI Zhicheng.INFLUENCE OF COBALT DOPING ON STRUCTURE AND ELECTRICAL PROPERTIES OF BARIUM TITANATE CERAMICS[J].Journal of The Chinese Ceramic Society,2009,37(3). |
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| Authors: | WANG Jian WANG Shencun ZHANG Hong LI Zhicheng |
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| Affiliation: | School of Materials Science and Engineering;Central South University;Changsha 410083;China |
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| Abstract: | 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 dec... |
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| Keywords: | cobalt-doped barium titanate ceramic crystal structure electrical property negative temperature coefficient conductivity mechanism |
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