The tracer diffusivity of Co in polycrystalline samples was studied between 600 and 950C, under an O partial pressure of 1atm, by using serial sectioning or secondary ion mass spectrometry methods. It was found that the present results fell upon the same Arrhenius curve,

D (cm2/s) = 1.4 x 101 exp[-280(kJ/mol)/RT]

as did previous data. Measurements of Co and Ni diffusion in the c-axis direction of monocrystalline platelets indicated that there was a much greater diffusional anisotropy in the case of Co.

J.L.Routbort, S.J.Rothman, N.Chen, J.N.Mundy, J.E.Baker: Physical Review B, 1991, 43[7], 5489-97