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| 六方晶系BaTi_(0.8)Co_(0.2)O_3的新型NTC热敏材料 | |
| 引用本文： | 汪健,张鸿,张哲,李志成. 六方晶系BaTi_(0.8)Co_(0.2)O_3的新型NTC热敏材料[J]. 材料科学与工程学报, 2009, 0(4) |
| 作者姓名： | 汪健 张鸿 张哲 李志成 |
| 作者单位： | 中南大学材料科学与工程学院; |
| 基金项目： | 教育部留学回国人员科研启动基金资助项目(2006331、20071108); 教育部高校博士点专项科研基金资助项目(20070533119) |
| 摘 要： | 为研究新型负温度系数(NTC)热敏陶瓷材料,采用以聚乙烯醇为聚合剂的湿化学法制备了BaTi0.8Co0.2O3粉体、用传统烧结方法制得陶瓷材料。通过X射线衍射分析了材料的晶体结构,利用电阻-温度特性测试仪研究了材料的电子导电性随温度的变化特性。结果发现,该材料具有六方晶系结构,电阻-温度特性具有明显的NTC效应。Co的掺入以及形成共面氧八面体使得钙钛矿型BaTiO3基陶瓷形成六方晶系结构;电子受热激活在Co3+/Co2+之间跃迁是材料呈现NTC效应的主要机制。 |
| 关 键 词： | BaTi0.8Co0.2O3陶瓷 六方晶系 NTC效应 导电性 |
Novel NTC Thermistor Based on Hexagonal BaTi_(0.8)Co_(0.2)O_3 |
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| WANG Jian,ZHANG Hong,ZHANG Zhe,LI Zhi-cheng. Novel NTC Thermistor Based on Hexagonal BaTi_(0.8)Co_(0.2)O_3[J]. Journal of Materials Science and Engineering, 2009, 0(4) | |
| Authors: | WANG Jian ZHANG Hong ZHANG Zhe LI Zhi-cheng |
| Affiliation: | WANG Jian,ZHANG Hong,ZHANG Zhe,LI Zhi-cheng(School of Materials Science , Engineering,Central South University,Changsha 410083,China) |
| Abstract: | To study a novel thermistor with a negative-temperature-coefficient(NTC),BaTi_(0.8)Co_(0.2)O_3 powder was prepared by a wet chemical process in which polymerization was carried out with polyvinyl alcohol,and the related ceramics were obtained by the conventional sintering technique.X-ray diffractometry was used to analyze the crystal structure,and resistance-temperature measurement system was applied to investigate the temperature dependence of electrical conductivity.The research found that the ceramics ha... |
| Keywords: | BaTi_(0.8)Co_(0.2)O_3 ceramic hexagonal structure NTC effect conductivity |
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