Measurements of 60Co diffusion in α-phase single crystals were performed by using radio-tracer and sectioning techniques. The results for 871 to 1145K could be described by:

D (m2/s) = 1.9 x 10-6 exp[-114.1(kJ/mol)/RT]

parallel to the c-axis, and by:

D (m2/s) = 3.2 x 10-6 exp[-126.1(kJ/mol)/RT]

perpendicular to the c-axis.

H.Nakajima, M.Koiwa, Y.Minonishi, S.Ono: Transactions of the Japan Institute of Metals, 1983, 24[10], 655-60