The in-diffusion of radioactive C from an atmosphere of 14CO2 was investigated at 723 to 1073K. Serial sectioning methods revealed diffusion profiles of complementary error function type. The results could be described by:

D (cm2/s) = 8.72 x 10-2 exp[-35.6(kcal/mol)/RT]

J.Cermak, F.Rollert, H.Mehrer: Zeitschrift für Metallkunde, 1990, 81[2], 81-3