Phase relations of ice under pressure

Abstract

In order to clarify the phase relations of ice at low temperatures, the transitions between various ice polymorphs were observed with a manganin sensor under pressure. The stable region of ice V disappeared at low temperature and the direct transition from ice II to ice VI was observed. The triple point of ice II, V, and VI exists in the neighborhood of -60°C and 6 kbar. The P-T phase diagram of H2O was compiled from the present data together with the literature data. © 1980 American Institute of Physics.