The most reliable linear correlation between diffusion and melting parameters is shown, by simple statistical analysis, to be that between the free energy of diffusion, ∆G, and the absolute melting temperature, Tm. However, the relationship is not exact and variations in the normalized ratio ∆G/Tm occur in a systematic pattern across the periodic table. It is suggested that these are due to the variation in the contribution of different electron shells to bonding. Other deviations may be associated with the anomalous melting points of some metals.
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