  X-ray diffraction (XRD) and M\"ossbauer spectroscopy techniques combined with
theoretical calculations based on the Korringa-Kohn-Rostoker (KKR) electronic
structure calculation method were used to investigate \sigma-phase
Fe_{100-x}Re_{x} alloys (x = 43, 45, 47, 49 and 53). Structural data such as
site occupancies and lattice constants were derived from the XRD patters, while
the average isomer shift and distribution curves of the quadrupole splitting
were obtained from the M\"ossbauer spectra. Fe-site charge-densities and the
quadrupole splittings were computed with the KKR method for each lattice site.
The calculated quantities combined with the experimentally determined site
occupancies were successfully used to decompose the measured M\"ossbauer
spectra into five components corresponding to the five sublattices.
