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Two intermetallic FeAl compounds with Al content of 70.68 and 72.17 at.pctwere studied using M\"ossbauer spectroscopy (5 to 296 K) and X-ray diffraction(15 to 300 K). The compounds were found to crystallize in the orthorhombic Cmcmspace group (eta-phase). The collected data revealed that dynamics of the Featoms (harmonic in entire temperature range) is significantly different that Alatoms. For the latter strong anharmonicity was evidenced. Moreover, it wasfound that partial filling of the different Al sites leads to occurrence of lowand high symmetry coordination of Fe atoms, which was reflected in occurrenceof two distinct doublets in M\"ossbauer spectra. All spectral parameters of thedoublets as well as the Debye temperature, force constant, kinetic andpotential energies of vibrations were determined. Those results revealedsignificant differences between both alloys, likely originating fromapproaching the stability boundary of the eta-phase for Fe-Al 72.17 at.pctalloy.

M\"ossbauer Spectroscopic and XRD Studies of two eta-Fe2Al5 Intermetallics