The atomic distribution in $\beta$-Mn$_{18}$Sn$_{2-x}$Fe$_x$ ($x=0\div2$) alloys has been studied by the $^{57}$Fe M$\stackrel{..}{o}$ssbauer spectroscopy. The earlier suggestion that the $8(c)$ sites in the $\beta$-Mn structure are favoured by iron atoms has been substantiated. Annealing was found to increase the degree of long-range order in the arrangement of iron atoms with respect to the $8(c)$ sites in the $\beta$-Mn structure. The presence of tin atoms in the $\beta$-Mn structure had virtually no effect on the degree of long-range order or iron atoms.
Department of General Physics, Department of Solid-State Physics, Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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