The diffusive behavior of 141Ce in 4N-purity material at 700 to 1100C was studied. The results could be described by:

D (cm2/s) = 6.6 x 10-1 exp[-60.8(kcal/mol)/RT]

A.R.Paul, R.P.Agarwala: Metallurgical Transactions, 1971, 2[9], 2691-5