Structural and thermodynamic characteristics of sH 2,2-dimethylbutane-methane deuterohydrate

• Deuterated and hydrogenated hydrates have the same structure type and space group.
• Deuterohydrate has the larger lattice constants and cage occupancies than hydrate.
• Deuterated hydrate is thermodynamically more stable than hydrogenated hydrate.

The structural features of mixed 2,2-dimethylbutane-methane deuterohydrate and 2,2-dimethylbutane-methane hydrogenated hydrate were studied by low-temperature powder X-ray diffractometer, and the thermodynamic properties of the two hydrates were investigated by studying their dissociation pressures within the temperature range of 277.05 to 283.85 K. The results obtained show that 2,2-dimethylbutane-methane deuterated hydrate and hydrogenated hydrate are the same in structure type (sH) and space group (P6/mmm), and the lattice constants and unit cell volume of the deuterohydrate are marginally larger than those of hydrogenated hydrate. The 2,2-dimethylbutane-methane deuterohydrate is thermodynamically more stable than 2,2-dimethylbutane-methane hydrogenated hydrate.

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