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Significance We report high-pressure neutron data which reveal a highly unusual behavior of the hydrogen dynamics in ice under high pressure: The transition rate from hydrogen-disordered ice VII to ordered ice VIII slows down dramatically up to 10 GPa but becomes more rapid again above. This finding is quantitatively explainable by a competition between the rotational and translational dynamics of water molecules. Our findings reply to a long-standing problem of unexplained anomalies of ice VII in the 10–15 GPa range reported by Raman spectroscopy, X-ray diffraction, and proton conductivity. Since ice VII and ice VIII are prototypical hydrogen-bonded materials with order–disorder transition, the pressure-induced cross-over in the hydrogen dynamics found in this study might be commonly observable in other materials.

Anomalous hydrogen dynamics of the ice VII–VIII transition revealed by high-pressure neutron diffraction