Cause of Change in the Rate of Electric Resistance Increase with Temperature in Metals and Alloys

摘要

Using the samples of molybdenum and alloy W-20% Re it has been proved experimentally that in metals and alloys the change of the rate of temperature growth of electric resistance, when it is not due to the phase or other transformations in the basic structure of semiconductor, is conditioned by gradual increase of near surface layer thickness H with temperature increase T, the layer possessing different properties as to the bulk, i. e. by the process of gradual transformation of the sample structure into such a layer. Therefore the temperature range, in which the growth rate changes, depends on the sample thickness. Regularity of the growth of H(T) in metals and alloys is the same: the layer thickness increases with the temperature according to exponential curve and at high T it can reach millimeter value. The absolute value H is determined by physical properties of the conductor. (Atomindex citation 14:805540)