The diffusive behavior of Re on various W surfaces was studied. The results

could be described by:

(110):     D (cm2/s) = 1.5 x 10-2 exp[-23.9(kcal/mol)/RT]

(211):     D (cm2/s) = 1.1 x 10-2 exp[-20.3(kcal/mol)/RT]

(321):     D (cm2/s) = 4.8 x 10-4 exp[-20.4(kcal/mol)/RT]

D.W.Bassett, M.J.Parsley: Journal of Physics D, 1970, 3[5], 707-16