The diffusive behavior of 68Ge was studied at 840 to 1050C. The results could be described by:

D (cm2/s) = 3.15 x 10-1 exp[-44.31(kcal/mol)/RT]

S.M.Klotsman, Y.A.Rabovskii, V.K.Talinskii, A.N.Timofeev: Fizika Metallov i Metallovedenie, 1971, 31[2], 429-31