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) = 5.9 x 10-2 exp[-78.8(kcal/mol)/RT]

It was noted that a solute element which decreased the melting point more also diffused faster.

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