ELASTIC CONSTANTS OF ICE Ih, UP TO 2.8 KBAR, BY BRILLOUIN SPECTROSCOPY

The technique of high resolution Brillouin spectroscopy has been used to determine accurately the hydrostatic pressure dependence of the elastic constants of ice Ih in the full pressure range of phase stability 0 - 2.8 kbar. The percentage changes in the adiabatic elastic constants c11, c12, c13, c33, c44 and bulk modulus, over the pressure range, are 3.0, 7.2, 8.4, 2.8, -1.5 and 5.6 percent per kbar respectively. Longitudinal and transverse velocities for polycrystalline ice aggregates are also determined over the pressure range.