Abstract
Zener's theory of D 0 is extended. By assuming correlations between the various quantities occurring in the theoretical expressions for the self-diffusion coefficient appropriate to the various current mechanisms of diffusion, and other properties of the lattice to which such quantities are most closely related, it is shown that the experimentally observed values of D 0 and Q (in the equation D = D 0 exp (− Q RT ) are consistent only with the supposition of a vacancy mechanism in face-centred metals and with a ring mechanism in body-centred cubic metals. Theoretical relations obtained for D, which include Zener's relation for D 0 as an approximate case, may be used to estimate values of D for those metals whose self-diffusion coefficients have yet to be measured.
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