Annealed high-density amorphous ice under pressure
Author: ["Richard J. Nelmes","John S. Loveday","Thierry Strässle","Craig L. Bull","Malcolm Guthrie","Gérard Hamel","Stefan Klotz"]
Publication: Nature Physics
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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.
Cite this article
Nelmes, R., Loveday, J., Strässle, T. et al. Annealed high-density amorphous ice under pressure. Nature Phys 2, 414–418 (2006). https://doi.org/10.1038/nphys313
