摘要
用溶胶-凝胶（Sol-gel）技术以及柠檬酸自燃方法制备了NiMn2.0-xFexO4（x=0、0．1、0．15、0．2、0．3）纳米氧化物粉体，并将得到的超细粉体进行压片、烧结、封装等工艺制得热敏电阻。用XRD、SEM、电阻测量等手段表征了烧结体材料的晶相、微观形貌以及电阻性能。电阻测量结果表明：随着铁离子的增加，所得热敏电阻的阻值增大。在所有获得的材料中，其灵敏度B值大于4300K，可认为是一种具有实际应用价值的负系数热敏电阻。
The nano-powders of NiMn2.0-xFexO4 （ x = 0,0. 1,0. 15,0. 2,0. 3） materials were prepared via solgel method and citrate auto-ignition route. After the precursor powders were pressed, sintered, and covered by epoxy, the negative temperature coefficient （NTC）thermistor of above materials was prepared, The crystal phase, microstructure and electrical properties were characterized by using XRD, SEM and resistance measurements. Resistance measurements indicated that the Fe substitution for Mn increased the electrical resistivity. The ceramics had a sensitivity index B which is higher than 4300K, and could be considered as advanced semi-conducting materials for NTC thermistor applications.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2005年第F11期170-172,共3页
Materials Reports
基金
宁波市科学技术局（20058100026）资助项目
