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Development of orthogonal tight-binding models for Ti-C and Ti-N systems

: Margine, E.R.; Kolmogorov, A.N.; Reese, M.; Mrovec, M.; Elsässer, C.; Meyer, B.; Drautz, R.; Pettifor, D.G.


Physical Review. B 84 (2011), No.15, Art. 155120
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
Journal Article
Fraunhofer IWM ()

We develop p-d orthogonal tight-binding (OTB) models for the description of TiCx and TiNx compounds in the 1.0>x>0.5 composition range. For the parametrization of bond integrals we use a recently developed method allowing projection of the one-electron wave functions obtained within the density functional theory onto optimized atom-centered orbitals. The performance of the OTB models is investigated for a wide range of properties: binding energy of elements and compounds, density of states, formation energy of vacancy-ordered defects, elastic constants, and phonon dispersions. The models provide a good description of the ground state properties at 1:1 composition and show a fair transferability for various atomic environments in elemental and binary phases.