It was found that the data for 800 to 900C, could be described by:

D (cm2/s) = 8.4 x 10-3 exp[-33.0(kcal/g-atom)/RT]

T.Oda, T.Takada, S.Kachi: Journal of the Japanese Society for Powder Metallurgy, 1967, 14, 118-25