Energies of the phases of ice at low temperature and pressure relative to ice Ih

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Abstract
The enthalpy of transformation to ice Ic of ice II, IX, V, VI, and VIII that have been recovered at 77 K and ambient pressure, and of the transformation of ice Ic to Ih, has been measured in a heat-flow calorimeter. The enthalpy of transformation of ice Ic to Ih depends on the high-pressure phase used to make the ice Ic. The thermodynamics of the transformation of ice IX, which was made by cooling ice III at 0.3–0.7 K s−1, to ice III shows that the ice IX was fully orientationally ordered to the precision of the experiments.

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