NiMn_(1.5)Fe_(0.5-χ)Ti_χO_4系热敏电阻的制备与性能研究  

Preparation of NiMn_(1.5)Fe_(0.5-χ)Ti_χO_4 Thermistor and Their Properties

作　　者：张嗣春[1] 夏海平[1] 张约品[1] 

机构地区：[1]宁波大学光电子功能材料研究所,宁波315211

出　　处：《武汉理工大学学报》2008年第11期8-11,共4页Journal of Wuhan University of Technology

基　　金：浙江省科技厅项目(2007C21121);宁波市科技局项目(2005B100026)

摘　　要：用传统的高温固相烧结法制备了NiMn1.5Fe0.5-χTiχO4(0<χ≤0.5)系列负温度系数(NTC)热敏电阻。通过X射线衍射分析、SEM、阻值测量等手段研究了TiO2组份对MnNiFe热敏电阻材料的晶相结构、微观形貌与电学性能的影响规律。结果表明:TiO2的加入并没有改变热敏电阻的典型尖晶石相结构,但是随着TiO2的加入,明显发现其烧结后陶瓷微晶粒变小而致密,这大概是由于掺入到晶格中的TiO2物质在烧结过程中起到迟缓晶粒生长的作用所致。在MnNiFeO系热敏电阻材料中掺入TiO2后,明显地改善了MnNiFe热敏电阻材料的阻温(电阻随温度)特性并提高了电学性能的稳定性。The negative temperature coefficient （NTC） thermistors, NiMn1.5Fe0.5-xTixO4（0〈x≤0.5）, were prepared by using a traditional solid-state reaction process. The effect of TiO2 on the micro-crystal phase, morphology of the microstructure and the electric properties of the ceramic were investigated through X-ray powder diffraction, SEM and electrical conductivity measurements. The results showed that the addition of TiO2 into MnNiFe system did not change the typical structure of Spinel for the thermistor. However, the micro-crystals of the ceramics begin to be smaller and denser as the introduction of TiO2 into composition. The result was probably ascribed to a dragging effect between the added TiO2 and the grain boundaries of Ti ion in the process of sintering ceramic. The addition of TiO2 improved the properties of resistance change of thermistors and stability of the electric properties obviously.

关 键 词：NiMnFeTiO系热敏电阻 TIO2 电学性能 烧结法 

分 类 号：TM286[一般工业技术—材料科学与工程]