V2O3Composite Thermistors

D. Moffatt, J. Runt, A. Safari, R. Newnham
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引用次数: 3

Abstract

The semiconductor lo metal phase transition found in vanadium (Ill) oxide, V 0 , was incorporated into a composite thermistor which exhibits an NTC as well as a PTC resistance effect. The composites were prepared using V O3 and several polymers including a flexible epoxy, a polyurekane and crystalline polyethylene. These composites showed large PTC resistivity effects of up to eight orders of magnitude. Depending on the type of polymer chosen, the transition !emperature at which the PTC phenomenon occurs can be changed. In addition, an NTC effect was observed at the temperature of the semiconductor to metal transition of the metal oxide filler. The resistivity versus temperature curve resembles a square well with three different conducting ranges: semiconductor to metal to insulator. Finally, the percolation curves for polyethylene composites were found to be a lunction of filler particle size z 3
V2O3Composite热敏电阻
在钒氧化物v0中发现的半导体低金属相变被纳入复合热敏电阻中,该热敏电阻表现出NTC和PTC电阻效应。该复合材料是由vo3和几种聚合物(包括柔性环氧树脂、聚氨酯和结晶聚乙烯)制备的。这些复合材料显示出高达8个数量级的PTC电阻率效应。根据所选聚合物的类型,PTC现象发生的转变温度可以改变。此外,在金属氧化物填料的半导体到金属转变的温度下,观察到NTC效应。电阻率与温度曲线类似于一个方形井,有三个不同的导电范围:半导体到金属到绝缘体。最后,发现聚乙烯复合材料的渗透曲线是填料粒径z3的函数
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