The diffusion of Sb in α-Fe was determined at 700 to 900C by using the residual activity method. The specimens were large-grained polycrystals for higher-temperature measurements, and single crystals for lower-temperature measurements. At above 800C, the data could be described by:

D (cm2/s) = 4.40 x 102 exp[-270(kJ/mol)/RT]

The activation energy was approximately equal to that measured for Fe self-diffusion within the same temperature range, although the Sb diffusion coefficients were a factor of ten larger than the Fe self-diffusion coefficients. It was shown that Mo had a negligible effect upon the diffusion of Sb in α-Fe.

G.A.Bruggeman, J.A.R.Roberts: Metallurgical Transactions A, 1975, 6[4], 755-60

Table 28

Diffusion Data for Sb in Fe