Abstract
The almost parabolic resistance–temperature characteristic shown by a thick-film resistor material (Heraeus 8241), printed on an alumina substrate, is explained in terms of thermal expansion effects in the x, y and z directions between 77 and 535 K. The piezoresistive equation is used to strip the thermal expansion contribution from the almost parabolic resistance–temperature characteristic, leaving a near linear resistance–temperature characteristic. It is suggested that the point of inflection on the resistance–temperature characteristic is primarily due to the non-linear temperature coefficient of expansivity of alumina.
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