Thermodynamic Properties of Vanadium Nitride

Abstract

Nitrogen–vanadium mononitride equilibrium in homogeneity region of the latter and in the VNx–V2Ny heterogeneous system has been studied by thermogravimetric method at nitrogen pressures 0.5…1000 hPа and temperatures 1573…1923 K. Dependence of equilibrium nitrogen pressure on composition and temperature was obtained using a thermodynamic model based on C. Wagner’s method of interaction parameters. Standard Gibbs formation energies of stoichiometric nitride at 1500…2000 K were calculated and an equation for formation energy of a nonstoichiometric nitride of given composition is presented.