Electron Diffraction Structural Investigations of Carbon Monoxide—Rare Gas Solid Mixtures

Electron-diffraction investigations have been carried out on binary solid mixtures COAr, COKr, and COXe. The mutual solubility of the components in high-temperature condensates (Tcond ≈︁ 25 to 30 K), is shown to be practically absent despite the small difference in the lattice parameters. Metastable solid solutions of f.c.c. and α-Co structure were observed in samples with Tcond < 25 K. As the molar content of a rare gas is raised, the α-CO lattice becomes “loose”. The effect is best pronounced with the COAr system while in COXe it is the weakest. At deposition temperatures below 5 K the mixtures of roughly equimolar compositions form amorphous layers on the substrate. When annealed, these transform into large-grained crystal structures of the high-temperature variety of the h.c.p. phase. At T ≈︁ 30 to 35 K the h.c.p. lattice can sometimes decompose into f.c.c. and α-CO. [Russian Text Ignored].

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