Abstract

The H2O ice phases VIII, VII, and X as well as their phase transformations are studied theoretically at 100 K as a function of pressure up to about 100 GPa. A combination of ab initio electronic structure calculations within the framework of density functional theory and the path integral representation of the nuclei is used. This allows the effects of thermal and quantum mechanical fluctuations on the properties of ice at high compression to be assessed separately and also in conjunction. Pronounced quantum effects are uncovered and different mechanisms are found to be at work at the antiferroelectric to paraelectric transition and the symmetrization transition.

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