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Propagation of the polyamorphic transition of ice and the liquid–liquid critical point

Nature volume 419, pages 599–603 (2002)Cite this article

Abstract

Water has a rich metastable phase behaviour that includes transitions between high- and low-density amorphous ices, and between high- and low-density supercooled liquids. Because the transitions occur under conditions where crystalline ice is the stable phase, they are challenging to probe directly. In the case of the liquids, it remains unclear1 whether their mutual transformation at low temperatures is continuous2,3, or discontinuous4,5 and terminating at a postulated second critical point of water that is metastable with respect to crystallization. The amorphous ices are more amenable to experiments6,7,8, which have shown that their mutual transformation is sharp and reversible. But the non-equilibrium conditions of these studies make a firm thermodynamic interpretation of the results difficult. Here we use Raman spectroscopy and visual inspection to show that the transformation of high-density to low-density amorphous ices involves the propagation of a phase boundary—a region containing a mixture of both ices. We find that the boundary region becomes narrower as the transformation progresses, and at higher transformation temperatures. These findings strongly suggest that the polyamorphic ice transition is discontinuous; a continuous transformation should occur uniformly over the entire sample9. Because the amorphous ices are structurally similar to their supercooled liquid counterparts, our results also imply that the liquids transform discontinuously at low temperatures and thus support the liquid–liquid critical-point theory4,5.

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Figure 1: Changes in the Raman spectrum of a high-density amorphous ice sample during annealing at different temperatures Tanneal.
Figure 2: Changes in properties of Raman spectra induced by annealing of amorphous ice at different temperatures.
Figure 3: The transformation of HDA to LDA as a function of time.
Figure 4: Raman spectra of an intermediate state at 25 K.
Figure 5: Phase changes in an amorphous sample at 111 K.
Figure 6: Visual observations of the transformations at 115, 123 and 128 K.

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Acknowledgements

We thank S. Sastry and P. G. Debenedetti for discussions and comments, and N. Kitamura for information on silica glass.

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  1. Advanced Materials Laboratory (AML), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, 305-0044, Japan

    Osamu Mishima & Yoshiharu Suzuki

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  1. Osamu Mishima
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Correspondence to Osamu Mishima.

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Mishima, O., Suzuki, Y. Propagation of the polyamorphic transition of ice and the liquid–liquid critical point. Nature 419, 599–603 (2002). https://doi.org/10.1038/nature01106

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