Abstract
Recent Raman studies on the pressure-induce amorphization of pure ice and ice in aqueous LiCl solution are reviewed. We investigated the change of in situ Raman spectra of ice Ih as functions of pressure and temperature. In this paper, I show the spectral evidence for the formation of strong hydrogen bonds in high-density amorphous ice (HDA) at high pressures and the close similarity in spectral features of relaxed HDA to that of supercooled water at high pressures and low temperatures. It is found that the ice phase in LiCl·12H2O also transforms to an amorphous phase at ∼520 MPa, as in the case of pressure-induced amorphization of pure ice Ih to the HDA. The spectral changes with temperature show the possible existence of a transition from the relaxed amorphous phase to the supercooled liquid at high pressures and low temperatures.
