Abstract
The formalism developed in molecular theory for calculation of local electronic-structure characteristics in a nonorthogonal atomic basis is generalized to systems with translational symmetry. Expressions have been derived to describe the bond orders, covalency, and valence in a crystal for restricted and unrestricted Hartree-Fock methods. Nonempirical electronicstructure calculations and an analysis of chemical bonding in the TiO2, Ti2O3, and TiO titanium oxide crystals have been performed.
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