CS-II binary clathrate hydrates at pressures of up to 15 kbar

The pressure dependence of the decomposition temperatures of binary clathra te hydrates of tetrahydrofuran with xenon and methane as well as of chlorof orm and carbon tetrachloride clathrates with xenon has been studied The abs ence of phase transitions at pressures from 1 to 15,000 bar indicates that the structure of all the hydrates remains constant (CS-II). The decompositi on temperatures of the binary hydrates of tetrahydrofuran and carbon tetrac hloride with xenon at 15 kbar (above 124 degreesC) are exceedingly high for polyhedral clathrate hydrates because the guest molecules are highly compl ementary to the cavities of the clathrate lattice. The paper also considers the packing density effect in the crystal structure of hydrates on the beh avior of the latter at elevated pressure.