Study of electronic structure and chemical bond in uranium carbide and uranium nitride by the method of Xsub(α) scattered waves and Xsub(α) discrete variation

By means of Xsub(α) scattered waves and Xsub(α) discrete variation (Xsub(α)SW and Xsub(α)DV) methods VC620- cluster electron construction is calculated for UC system. UN615- cluster for UN system is calculated by Xsub(α)DV method. Contour maps of molecule orbitals for valency level are plotted. Calculation correction is confirmed by the comparison with UC, UN photoemission spectra. Established are a noticeable participation of uranium 5f-orbitals in a chemical bond and considerable covalence. A covalence degree decreases from UC to UN. It is shown that for stoichometric UC, close to NaCl ideal structure noticeably higher melting and microhardness temperatures should be expected than it has been observed in the experiment