It was recalled that the point-defect contribution to the electrical resistivity of W could also be deduced from equilibrium measurements. The defect contribution at the melting point was estimated to amount to 5 x 10-7cm. The high entropies of vacancy formation, that had previously been deduced from a non-linear increase in the high-temperature specific heat, were consistent with thermodynamic bounds and agreed with self-diffusion data. The temperature dependence of the enthalpies of vacancy formation in metals was calculated by assuming a linear temperature dependence of the formation entropy. Experimental and theoretical results which had been obtained during the last decade supported equilibrium defect concentrations that were based upon non-linear increases in the high-temperature specific heat of metals.

Y.Kraftmakher: Philosophical Magazine A, 1996, 74[3], 811-22