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Glass-liquid transition of water at high pressure
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för fysik.
2011 (engelsk)Inngår i: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 108, nr 27, s. 11013-11016Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The knowledge of the existence of liquid water under extreme conditions and its concomitant properties are important in many fields of science. Glassy water has previously been prepared by hyperquenching micron-sized droplets of liquid water and vapor deposition on a cold substrate (ASW), and its transformation to an ultraviscous liquid form has been reported on heating. A densified amorphous solid form of water, high-density amorphous ice (HDA), has also been made by collapsing the structure of ice at pressures above 1 GPa and temperatures below approximately 140 K, but a corresponding liquid phase has not been detected. Here we report results of heat capacity C(p) and thermal conductivity, in situ, measurements, which are consistent with a reversible transition from annealed HDA to ultraviscous high-density liquid water at 1 GPa and 140 K. On heating of HDA, the Cp increases abruptly by (3.4 ± 0.2) J mol-1 K-1 before crystallization starts at (153 ± 1) K. This is larger than the Cp rise at the glass to liquid transition of annealed ASW at 1 atm, which suggests the existence of liquid water under these extreme conditions.

sted, utgiver, år, opplag, sider
National Academy of Sciences , 2011. Vol. 108, nr 27, s. 11013-11016
Emneord [en]
glass transition, pressure-induced amorphization, relaxation
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Identifikatorer
URN: urn:nbn:se:umu:diva-49347DOI: 10.1073/pnas.1016520108OAI: oai:DiVA.org:umu-49347DiVA, id: diva2:455309
Tilgjengelig fra: 2011-11-10 Laget: 2011-11-09 Sist oppdatert: 2018-06-08bibliografisk kontrollert

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