Article abstract
Nature Physics 2, 414 - 418 (2006)
doi:10.1038/nphys313
Subject Categories: Statistical physics, thermodynamics and nonlinear dynamics | Materials physics
Annealed high-density amorphous ice under pressure
Richard J. Nelmes1, John S. Loveday1, Thierry Strässle2, Craig L. Bull1, Malcolm Guthrie1, Gérard Hamel2 and Stefan Klotz2
Abstract
The well-known expansion of water on cooling below 277 K is one of several peculiar properties that could signal a second critical point near 220 K and 0.1 GPa in pressure, deep in the supercooled liquid phase. Evidence for this would be a first-order transition line between two distinct supercooled liquids at temperatures below the critical point. As that lies below the minimum crystallization temperature, experimental tests have instead used low- and high-density amorphous ices—LDA and HDA—as proxies for the supercooled liquids. But numerous studies over the past decade have not yielded a clear consensus about the nature of the HDA/LDA transition. Here we identify a previously uncharacterized state of high-density amorphous ice obtained if HDA is annealed at pressures near 2 kbar. The transition between this annealed HDA and LDA is strikingly different from the behaviour found in earlier work, in a way that favours the two-liquid model.
- SUPA, School of Physics and Centre for Science at Extreme Conditions, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, UK
- Physique des Milieux Denses, IMPMC, CNRS-UMR 7590, Université Pierre et Marie Curie, 75252 Paris, France
Correspondence to: Richard J. Nelmes1 e-mail: r.j.nelmes@ed.ac.uk
Correspondence to: John S. Loveday1 e-mail: j.loveday@ed.ac.uk
Correspondence to: Thierry Strässle2 Present address: Laboratory for Neutron Scattering, ETH Zürich and Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
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