Experimental and theoretical studies of solid N2–O2 solutions

The temperature and concentration dependences of the molar volume of O2–N2 solid solutions are studied in the monophase region by x-ray diffraction technique, using the phase equilibrium data obtained earlier. Anomalies are observed in the thermal expansion of phases based on α- and β–N2. Prigogine’s mean field approximation is used to study the free energy and thermodynamic properties of solid solutions N2–O2. Partial pressures of saturated vapor are calculated and it is shown that the oxygen concentration of vapor for weak solutions of O2 in N2 is more than an order of magnitude higher than the oxygen concentration in the solid phase. It is shown that the observed anomalies in the thermodynamic characteristics of solid solutions are associated with the peculiarities of orientational states of oxygen molecules in the nitrogen matrix.

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