The diffusive behavior of 14C was studied at 930 to 1800C. The results could be described by:

D (cm2/s) = 3.3 x 10-2 exp[-37.9(kcal/mol)/RT]

P.Son, S.Ihara, M.Miyake, T.Sano: Journal of the Japan Institute of Metals, 1967, 31, 998-1001