Diffusion studies were carried out by depositing layers of the diffusing species, and annealing at 1161 to 2200C. The results could be described by:

D (cm2/s) = 6.1 x 10-1 exp[-94.9(kcal/mol)/RT]

D.Ablitzer, M.Gantois: Colloques de Métallurgie , 1976, 19, 299-316

The best linear fits to the solute diffusion data ([1015] to [1019], [1021] to [1030]) yield:

H: Ln[Do] = 0.55E – 9.4 (R2 = 0.92); N: Ln[Do] = 0.23E – 12.2 (R2 = 0.73);

Nb: Ln[Do] = 0.20E – 19.4 (R2 = 0.94)