Structural transformations in N2–Kr alloys

Abstract

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.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.