The bulk diffusivity of 14C was studied at 450 to 1200C. On the basis of the results, it was proposed that the diffusivity could be described by:

D (cm2/s) = 1.9 x 10-1 exp[-37.4(kcal/mol)/RT]

R.P.Agarwala, M.C.Naik, M.S.Anand, A.R.Paul: Journal of Nuclear Materials, 1970, 36[1], 41-7