INTERACTIONS OF IRON IMPLANTS IN TRANSITION-METALS

Au, Lr, Pt, Rh, Ti, and W foils were implanted with Fe-57 ions with doses from 10(15) to 5 X 10(16) ions/cm(2) and studied at room temperature by conversion electron Mossbauer spectroscopy. It has been proved that the macroscopic heat of solution of Fe in respective metals is a primary parameter determining the state of implanted specimens. For an attractive Fe-Fe potential the iron implants are observed in the form of aggregates, while for a repulsive Fe-Fe potential, they are not distinguishable in Mossbauer spectra. Molecular-dynamics simulations showed that the final arrangement of atoms within a thermal spike is maintained during about 1.2 ps.