Bulk diffusion in single crystals was studied at 827 to 1192K. The diffusion coefficients were found to range from 1.2 x 10-18 to 1.1 x 10-11cm2/s. The results could be described by:

D (cm2/s) = 1.8 x 104 exp[-83.3(kcal/mol)/RT]

P.Dorner, W.Gust, A.Lodding, H.Odelius, B.Predel, U.Roll: Zeitschrift für Metallkunde, 1982, 73[5], 325-30