Abstract
We develop - orthogonal tight-binding (OTB) models for the description of TiC and TiN compounds in the 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.
- Received 4 July 2011
DOI:https://doi.org/10.1103/PhysRevB.84.155120
©2011 American Physical Society