Covalent and metallic bonding within the quasi-ion approach

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Abstract
A recently proposed theory of a quasi-ion description of solids is used to discuss simultaneously the dynamics of bonding and its relation to the phonon dispersion in crystals. The theory can be applied in principle to all types of bonding and allows a rigorous separation into ‘‘two-center’’ forces and proper many-body interactions. Applications for this separation are provided with respect to the metallic and covalent bonding type. In particular it is shown, using Si as an example, how angular rigidity of the covalent bond can be described by relative rotations of the quasi ions. In case of metallic bonding, special many-body effects leading to an anomalous phonon dispersion are investigated within a simple model.