Metastable ice VII at low temperature and ambient pressure

@article{Klotz1999MetastableIV,
  title={Metastable ice VII at low temperature and ambient pressure},
  author={Stefan Klotz and J. M. Besson and Gerard J. Hamel and Richard J. Nelmes and John S. Loveday and W G Marshall},
  journal={Nature},
  year={1999},
  volume={398},
  pages={681-684}
}
Ice exhibits many solid-state transformations under pressure, and also displays a variety of metastable phases. 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 planets. 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… 
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