The diffusion behavior of Fe in single crystals of Al was monitored by means of 57Fe Mössbauer line-broadening measurements. It was deduced that the Fe atoms migrated by exchanging sites with nearest-neighbor vacancies. The binding energy of an Fe-vacancy complex was estimated to be about 0.29eV. The diffusivity results could be described by:

D (cm2/s) = 1.1 x 104 exp[-2.3(eV)/kT]

S.Mantl, W.Petry, K.Schroeder, G.Vogl: Physical Review B, 1983, 27[9], 5313-31