The self-diffusion of C in hyperstoichiometric UC was measured in the single-phase region, using a radioactive tracer and sectioning technique. The diffusion equations were:

UC1.38:      D(cm2/s) = 0.10 exp[-53.5(kcal/mol)/RT]

for 2100 to 2230C.

UC1.52:      D(cm2/s) = 0.11 exp[-54.6(kcal/mol)/RT]

for 1950 to 2150C.

Y.Making, P.Son, M.Miyake, T.Sano: Journal of Nuclear Materials, 1973, 49[2], 225-31