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.