An expression for the temperature dependence of recoil‐free fraction of iron atoms was derived from the two‐band theory proposed previously by the present authors, and it was applied to investigate the bonding characteristics of iron in amorphous Fe83B17, Fe80B20, and Fe80P20alloys. The characteristic temperatures were found to be &thgr;1=605 K and &thgr;3=230 K for amorphous Fe83B17, &thgr;1=655 K and &thgr;3=185 K for amorphous Fe80B20, and &thgr;1=425 K and &thgr;3=185 K for amorphous Fe80P20. The comparison between these values with those obtained from the specific‐heat measurements showed a good agreement for &thgr;1, which is a measure of interatomic bond strength, indicating that metalloid atoms are not connected to each other in these Fe–mettalloid binary amorphous alloys but are bonded to iron atoms. Based on this result, the force constant was estimated for Fe–B, Fe–P, and Fe–Fe bonds. On the other hand, the values of &thgr;3obtained from the Mo¨ssbauer study were significantly different from those obtained from specific‐heat measurements.