Preliminary solid–solid phase diagram for nitrogen–methane mixtures by x-ray diffraction

The lattice of molecular centers of solidified mixtures of methane and nitrogen has been determined by x-ray diffraction for a representative sample of temperatures and concentrations. Face centered cubic packing of molecules dominates the solid–solid phase diagram, except for temperatures above 36 K and high molar concentrations of nitrogen, where the hexagonal closest packing characteristic of the β phase of solid nitrogen persists.

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