The diffusive behavior of 91Y at 1200 to 1600C was studied. The results could be described by:

D (cm2/s) = 6.7 x 10-3 exp[-68.1(kcal/mol)/RT]

D.S.Gornyi, R.M.Altovskii: Fizika Metallov i Metallovedenie, 1971, 31[4], 781-5