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The Na-X (X = Si, Ag, Cu, Cr) systems have been critically reviewed and  modeled by means of the CALPHAD approach. The two compounds, NaSi and Ag2Na,  are treated as stoichiometric ones. By means of first-principles  calculations, the enthalpies of formation at 0 K for the LT-NaSi (low  temperature form of NaSi) and Ag2Na have been computed to be -5210 and  -29821.8 Jmol-1, respectively, with the desire to assist thermodynamic  modeling. One set of self-consistent thermodynamic parameters is obtained for  each of these binary systems. Comparisons between calculated and measured  phase diagrams show that most of the experimental information can be  satisfactorily accounted for by the present thermodynamic descriptions

Thermodynamic modeling of the Na-X (X = Si, Ag, Cu, Cr) systems