โ Scribed by N. Boden
No coin nor oath required. For personal study only.
The translational jump frequencies as measured by NMR methods in a wide variety of cubic solids including the rare gases and orientationally disordered (plastic) crystals are shown to converge to an approximately constant value at the melting point. Titis value is characteristically a factor of five greater for bee than fee solids and independent of the degree of orientational disorder. It is argued that this behaviour is the origin of the empirical correlations between the free energies of self-diffusion and the melting temperatures of cubic metals.
๐ SIMILAR VOLUMES
Diffusion coefficients for "\*Ti and "\*V in titanium-vanadium alloys were determined at 10 wt.?; increments in the temperature range of 900ยฐC to within about 50ยฐC of the melting points. The data 8re adequately described by continuously curved lines on Arrhenius-type plots. ## SELF-DIFFUSION DANS L