Ir5Sn7, Ir3Sn7 and newly obtained IrSn4 /4/ exhibit complex Mossbauer spectra. The positions of the individual lines range from 0.82 to 3.0 mm/s and the average isomer shift\(\overline {IS} \) derived for each compound of Sn atomic percentage x follows the relationship:\(\overline {IS} = 0.60 + 0.0194 x\). Rather large quadrupole splittings are obtained. The f factors are about 0.20 at 295 K and 0.37 at 78 K, from which Debye temperatures of 200 to 300 K have been calculated.