In order to obtain a better notion of the experimental results in our laboratory, Monte Carlo calculations have been performed of the N2-Ar crystal on the N2-rich side, in the p-T region where the e and δ phases exist in pure N2. Considering the enthalpy, the system prefers the Ar atoms to be located on the sphere positions. The e* phase is present for mixtures down to\( x_{N_2 } = 0.90 \)but is most likely metastable. The e*-δ* transition shifts to lower temperatures with decreasing\(x_{N_2 } \). The 2ndorder transition within the δ phase continues to exist to even smaller\(x_{N_2 } \). In contrast to the e* -δ* transition, the transition temperature for the 2ndorder transition does not shift to lower temperatures. For a mixture of\(x_{N_2 } = 0.83,\)it is within 5 K from the pure 2ndorder transition at a pressure of 7.0 GPa.