Аннотация:A thermodynamic model is proposed for condensed phases in the ternary system Nb–Zr–N in the range 298–3000 K. The model is based on available experimental data and previously reported models of the constituent binaries Nb–Zr, Nb–N, and Zr–N. It is consistent with a previously reported subsolidus phase diagram of the Nb–Zr–N system and allows one to assess phase equilibria involving liquid phase.