Abstract

A tight-binding recursion method is used to study the electronic and cohesive properties of stoichiometric and substoichiometric transition metal-carbides crystallizing with the NaCl structure. The electronic structure is analyzed in terms of a p-d interaction between the p orbitals of C and the d orbitals of the transition metal. Concerning the cohesive properties of these compounds, we have calculated the energies of formation of stoichiometric (Ti, Zr, Hf, V, Nb, Ta)-C compounds and compared with the experimental values. We have also studied the stability of vacancy-ordered compounds with a vacancy concentration of 50% on the carbon sublattice, i.e. M 2C compounds.

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