The room-temperature zero-field 57Fe Mössbauer spectra were recorded in transmission geometry with constant acceleration using a conventional Mössbauer spectrometer with a 50 mCi 57 Co(Rh) source. The samples were sealed in the sample holder in an argon atmosphere. The spectra were fitted using Recoil 1.05 Mössbauer Analysis Software. The isomer shift values are given with respect to a α-Fe reference at room temperature.