Metastable ice VII at low temperature and ambient pressure

S. Klotz (), J. M. Besson, G. Hamel, R. J. Nelmes, J. S. Loveday and W. G. Marshall
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S. Klotz: Physique des Milieux Condenss UMR 7602
J. M. Besson: Physique des Milieux Condenss UMR 7602
G. Hamel: Départment des Hautes Pressions, Université P&M Curie
R. J. Nelmes: The University of Edinburgh
J. S. Loveday: The University of Edinburgh
W. G. Marshall: ISIS Facility, Rutherford Appleton Laboratory

Nature, 1999, vol. 398, issue 6729, 681-684

Abstract: Abstract Ice exhibits many solid-state transformations under pressure, and also displays a variety of metastable phases1. Most of the high-pressure phases of ice can be recovered at ambient pressure provided that they are first cooled below about 100 K. These ice polymorphs might exist on the surfaces of several satellites of the outer planets2. One of the few exceptions to this (meta)stability on quenching has been ice VII, the dominant high-pressure phase. Here we show that isothermal compression of D2O ice VI below 95 K produces pure ice VII, and that this phase can remain stable at atmospheric pressure. It remains metastable indefinitely at 77 K. Like the other recoverable ice phases, it transforms to low-density amorphous ice between about 120 and 150 K at 1 bar. Thetemperature range over which ice VII remains metastable increases markedly on compression to 6 GPa, indicating that ice VII is in fact the most robust of all the metastable ice phases.

Date: 1999
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DOI: 10.1038/19480

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