Abstract
Acoustic velocities and adiabatic elastic constants of structure I of methanehydrate (MH) have been determined as a function of pressure up to 0.6 GPa at23°C by the high-pressure Brillouin spectroscopy developed for a singlemolecular crystal. The pressure dependence of the acoustic velocities of MH isvery similar to that of ice-Ih except for the longitudinal acoustic (LA)velocity. The value of the LA velocity along the ⟨100⟩direction of MH at 0.02 GPa is 3.63 km s−1 which is about 7% lower than theaverage of the LA velocities in the ice-Ih phase at −35.5°C and atmosphericpressure.
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