The diffusion of 181Hf in the γ-phase was studied at 1110 to 1360C. The results could be described by:

D (cm2/s) = 3.6 x 103 exp[-97.3(kcal/mol)/RT]

A.W.Bowen, G.M.Leak: Metallurgical Transactions, 1970, 1[6], 1695-700