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 (figure 9). It was found that the present results (table 77) 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