Electron-momentum distribution and charge-transfer study of vanadium silicides

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Abstract
Charge transfer and electron-momentum distribution of the three vanadium silicides VSi2, V5Si3 and V3Si have been studied using a γ-ray Compton scattering technique. The results support the model where charge transfer takes place from silicon to vanadium atoms. The charge transfer value, however, turns out to be smaller than that reported by Staudenmann et al. (1976) from charge density measurements on V3Si. Despite widely different stoichiometry and crystal structure, the electronic state of silicon atoms in VSi2 and V5Si3 appears to be identical. The nature of bonding in these silicides is discussed in terms of a superposition model. A proper solid-state calculation is, however, needed to explain the details of electron momentum distributions in these compounds.