The diffusion of Sb in Fe was measured at 773 to 873K by using ion-beam methods. This extended previous diffusion-rate data downwards by 5 orders of magnitude. Diffusion couples, formed by ion-implanting Sb into Fe, were vacuum-annealed; with the composition versus depth being determined by means of ion-backscattering analysis. Precipitation within the implanted region was characterized by transmission electron microscopy. Theoretical analysis of the data was based upon coupled differential equations for the concentration profile and the precipitate radii. The diffusion data (table 28) could be described by:

773-873K:     D (cm2/s) = 8.0 x 101 exp[-32460/T]

S.M.Myers, H.J.Rack: Journal of Applied Physics, 1978, 49[6], 3246-54