It was found that the data for monocrystalline and polycrystalline samples, at 640 to 903C, were described by:

D (cm2/s) = 1.1 x 10-1 exp[-40.8(kcal/mol)/RT]

R.D.Johnson, A.B.Martin: Physical Review, 1952, 86, 642

The best linear fits to the solute diffusion data ([473] to [487], [517] to [528]) yield:

Ag: Ln[Do] = 0.33E – 15.5 (R2 = 0.73); O: Ln[Do] = 0.69E – 13.2 (R2 = 0.998);

O(l): Ln[Do] = 0.42E – 9.4 (R2 = 0.98)