Mössbauer measurements in iron-base alloys with nontransition elements

The hyperfine field and isomer shift at iron sites in dilute iron-base alloys containing Ge, As, Sn, and Sb impurities were determined by M\"ossbauer measurements. Similar information was obtained for the tin sites in Fe Sn alloys. These experimental data, together with those published earlier for Al, Si, and Ga solutes, support a model which supposes that only the impurity excess p electrons take part in the charge screening. The interactions between iron spin-up $3d$ electrons and impurity 4s² or 5s² electrons are held responsible for the increase in iron moment with impurity concentration in the case of Ga, Ge, As, Sn, and Sb solutes.