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برق و الکترونیک::
دی اکسید وانادیوم
One of the earliest papers on vanadium dioxide describes19 a range of bead thermistors based on this material which were given the name Critical Temperature Resistors (CTR).
A thin film version of the vanadium dioxide thermistor was first reported20 in 1967.
Subsequent heat treatment in oxygen at 500°C was necessary to convert the vanadium oxide formed into vanadium dioxide and so develop the resistivity ''jump" in the characteristic.
One major disadvantage of the vanadium dioxide thermistors is that the switch temperature is effectively fixed at 67 C by the properties of the material.
A number of attempts have been made to modify the vanadium dioxide transition point by the addition of various elements to form oxide compounds or solid solutions.
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