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Winkel K, Elsaesser MS, Mayer E, et al. Water polyamorphism: reversibility and (dis)continuity. J Chem Phys. 2008;128(4):044510doi: 10.1063/1.2830029.
Winkel, K., Elsaesser, M. S., Mayer, E., & Loerting, T. (2008). Water polyamorphism: reversibility and (dis)continuity. The Journal of chemical physics, 128(4), 044510. https://doi.org/10.1063/1.2830029
Winkel, Katrin, et al. "Water polyamorphism: reversibility and (dis)continuity." The Journal of chemical physics vol. 128,4 (2008): 044510. doi: https://doi.org/10.1063/1.2830029
Winkel K, Elsaesser MS, Mayer E, Loerting T. Water polyamorphism: reversibility and (dis)continuity. J Chem Phys. 2008 Jan 28;128(4):044510. doi: 10.1063/1.2830029. PMID: 18247972.
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J Chem Phys. 2008 Jan 28;128(4):044510. doi: 10.1063/1.2830029.

Water polyamorphism: reversibility and (dis)continuity.

The Journal of chemical physics

Katrin Winkel, Michael S Elsaesser, Erwin Mayer, Thomas Loerting

Affiliations

  1. Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, AustriaInstitute of Physical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria.

PMID: 18247972 DOI: 10.1063/1.2830029

Abstract

An understanding of water's anomalies is closely linked to an understanding of the phase diagram of water's metastable noncrystalline states. Despite the considerable effort, such an understanding has remained elusive and many puzzles regarding phase transitions in supercooled liquid water and their possible amorphous proxies at low temperatures remain. Here, decompression of very high density amorphous ice (VHDA) from 1.1 to 0.02 GPa at 140 K is studied by means of dilatometry and powder x-ray diffraction of quench-recovered states. It is shown that the three amorphous states of ice are reversibly connected to each other, i.e., LDA<-->e-HDA<-->VHDA. However, while the downstroke VHDA-->e-HDA transition takes place in the pressure range of 0.06 GPaLDA transition takes place quasi-discontinuously at p approximately 0.06 GPa. That is, two amorphous-amorphous transitions of a distinct nature are observed for the first time in a one-component system-a first-order-like transition (e-HDA-->LDA) and a transition which is not first-order like but possibly of higher order (VHDA-->e-HDA). VHDA and e-HDA are established as the most stable and limiting states in the course of the transition. We interpret this as evidence disfavoring the hypothesis of multiple first-order liquid-liquid transitions (and the option of a third critical point), but favoring a single first-order liquid-liquid transition (and the option of a second critical point).

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