The diffusive behavior of 56Co was studied at 580 to 1160C. The results depended upon the depth of penetration and could be described by:

near-surface:     D (cm2/s) = 1.3 x 102 exp[-2.9(eV)/kT]

bulk:     D (cm2/s) = 1.9 x 100 exp[-2.0(eV)/kT]

G.S.Kulikov, I.N.Nikulitsa: Fizika Tverdogo Tela, 1972, 14[9], 2704-7

Figure 19

Diffusion of Cr in GaAs