A.A. Solodovnik, N.S. Mysko-Krutik, and M.I. Bagatskii
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
Received March 6, 2017, revised June 6, 2017
With the use of transmission electron diffraction, the structure of N2–CH4 alloys was studied in the en-tire region of mutual concentrations. The samples were prepared in situ by depositing a gaseous mixture on an aluminum and carbon substrate at temperatures of 19 and 5 K. The solubility regions and the structure of the solutions were determined. The limiting solubilities of the components are: methane in a nitrogen crystal is less than 6 mol.%, nitrogen in solid methane is less than 35 mol.%. For small concentrations of components in solutions an analysis was made of the dependence of the lattice parameter on the composition in the framework of the three-cluster model. The effect of impurity CH4 molecules on the orientational ordering of N2 molecules in solutions was investigated.
PACS: 78.55.Kz Solid organic materials; PACS: 61.05.J– Electron diffraction and scattering; PACS: 81.30.Bx Phase diagrams of metals, alloys, and oxides.