Transmission electron diffraction is used to study the structure of N2-CH4 alloys over the entire range of mutual concentrations. Samples were prepared in situ by deposition of a gaseous mixture on aluminum and carbon substrates at temperatures of 19 and 5 K. The solubility limits for the components are less than 6% methane in crystalline nitrogen and 35% nitrogen in solid methane. The dependence of the lattice parameter on composition is studied in terms of a three-cluster model for low concentrations of the components in the solutions. The effect of impurity CH4 molecules on the orientational ordering of N2 molecules in the solutions is investigated.

The transmission electron diffraction technique has been used to explore in detail solid argon-krypton solutions in a temperature range of 5–44 K. Specimens were prepared in situ by depositing the gaseous mixture on a base at temperatures 5 and 20 K. The structure of the Ar–Kr alloys was found to correspond to the face-centered cubic lattice in the entire range of reciprocal concentrations. In the concentration range of 50–70 mol % Ar, separation of the solution into two phases has been observed. The regions where solid argon-krypton solutions exist have been determined. Kinetics of relaxation processes stimulated by annealing the specimens has been studied. Conclusions regarding character of the Ar–Kr system state diagram have been made using the analysis of experimental data.

The structural characteristics of N2–Kr alloys were studied using electron diffraction over the entire range of mutual concentrations. The samples were prepared in situ by condensing a gaseous mixture on aluminum and carbon substrates at temperatures of 5 and 20 K. The structure and solubility regions of the solutions were determined. The maximum solubility values of the components were: less than 20 mol.% for krypton in a nitrogen crystal, and less than 11 mol.%. for nitrogen in solid krypton. Phase separation of the solid solution was observed in a concentration range of 20–89 mol.% Kr. The effect of diluting the molecular matrix with krypton on the orientational ordering of N2 molecules in the solutions was investigated. An experimental dependence of the orientation order parameter on the solution composition was determined for N2-based solutions.

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