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Electronic structure of crystalline uranium nitride: LCAO DFT calculations

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Abstract

The results of electronic structure calculations performed for the first time for crystalline uranium nitride and using a LCAO basis are discussed. For calculations we used the density functional method with the PW91 exchange correlation potential and a variety of relativistic core potentials for the uranium atom. The calculated atomization energy of the crystal agrees well with the experimental data and with the results of calculations with the plane wave basis. It is shown that a chemical bond in crystalline uranium nitride is a metal covalent bond. The metal component of the bond is due to the 5f electrons localized on the uranium atom and having energies near the Fermi level and the bottom of the conduction band. The covalent component of the chemical bond results from an overlap between the uranium 6d and 7s valence orbitals and the nitrogen 2p atomic orbitals. Inclusion of the 5f electrons in the core of the uranium atom introduces relatively minor changes in the calculated binding energy and electron density distribution.

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Authors and Affiliations

  1. St. Petersburg State University, Russia

    R. A. Évarestov, A. I. Panin & M. V. Losev

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  1. R. A. Évarestov
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  3. M. V. Losev
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Correspondence to R. A. Évarestov.

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__________

Translated from Zhurnal Strukturnoi Khimii, Vol. 48, Supplement, pp. S132–S141, 2007.

Original Russian Text Copyright © 2007 by R. A. Évarestov, A. I. Panin, and M. V. Losev

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Évarestov, R.A., Panin, A.I. & Losev, M.V. Electronic structure of crystalline uranium nitride: LCAO DFT calculations. J Struct Chem 48 (Suppl 1), S125–S133 (2007). https://doi.org/10.1007/s10947-007-0155-0

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