The diffusion of Co in epitaxial n-type layers on the (100) surface of Cr-doped material, or in Sn-doped crystals, was studied by using radiotracer (60Co) and sectioning techniques. It was deduced that the diffusivity of Co at 800 to 1000C could be described by:

epitaxial layer:   D (cm2/s) = 7.10 x 102 exp[-2.5(eV)/kT]

bulk:   D (cm2/s) = 5.00 x 102 exp[-2.5(eV)/kT]

T.D.Dzhafarov, E.A.Skoryatina, E.S.Guds, I.E.Moronchuk: Physica Status Solidi A, 1979, 51[2], K221-5