Abstract
A directed valence analysis of metalloid (M) atoms in various structures has been performed and discussed in terms of the ligand p-d bond model. It is shown that p-d bonding cannot have a direct effect on the moment of Fe atoms in bcc Fe-M alloys, whereas in most other transition-metalmetalloid (T-M) structures with ferromagnetic T atoms as solvents, it is shown that p-d bonding can reduce the moments of the T atoms. The small moment variations in bcc Fe-M alloys could be caused instead by variations in the intraband exchange splitting, as a result of changes in the lattice constant.