Cubic symmetry around iron in CoSi2

The Mossbauer spectra of Fe-57 in CoSi2 have been measured in 3.5 and 4.0 T external magnetic fields. The measured spectra showed only magnetic splitt ing thereby proving the cubic symmetry around Fe-57 atoms in CoSi2 (fluorit e-type lattice). Two iron positions were found: in one the iron atoms subst itute Co atoms, in the other one the iron populates the empty cubic site in the lattice. It is considered that the results may well contribute to clar ifying the atomic positions and local symmetries in metastable Co- and Fe-s ilicides forming after implantation of Co and Fe in Si at elevated temperat ures.