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Effect of salt on the H-bond symmetrization in ice
University of Paris 06, France; Ecole Polytech Federal Lausanne, Switzerland.
Ecole Polytech Federal Lausanne, Switzerland.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Teoretisk Fysik. Linköpings universitet, Tekniska fakulteten. University of Paris 06, France.
University of Paris 06, France.
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2015 (Engelska)Ingår i: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 112, nr 27, s. 8216-8220Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The richness of the phase diagram of water reduces drastically at very high pressures where only two molecular phases, proton-disordered ice VII and proton-ordered ice VIII, are known. Both phases transform to the centered hydrogen bond atomic phase ice X above about 60 GPa, i.e., at pressures experienced in the interior of large ice bodies in the universe, such as Saturn and Neptune, where nonmolecular ice is thought to be the most abundant phase of water. In this work, we investigate, by Raman spectroscopy up to megabar pressures and ab initio simulations, how the transformation of ice VII in ice X is affected by the presence of salt inclusions in the ice lattice. Considerable amounts of salt can be included in ice VII structure under pressure via rock-ice interaction at depth and processes occurring during planetary accretion. Our study reveals that the presence of salt hinders proton order and hydrogen bond symmetrization, and pushes ice VII to ice X transformation to higher and higher pressures as the concentration of salt is increased.

Ort, förlag, år, upplaga, sidor
National Academy of Sciences , 2015. Vol. 112, nr 27, s. 8216-8220
Nyckelord [en]
salty ices; extreme conditions; ice bodies; H-bond symmetrization; proton quantum effects
Nationell ämneskategori
Den kondenserade materiens fysik
Identifikatorer
URN: urn:nbn:se:liu:diva-120342DOI: 10.1073/pnas.1502438112ISI: 000357527600040PubMedID: 26100876OAI: oai:DiVA.org:liu-120342DiVA, id: diva2:843900
Anmärkning

Funding Agencies|Swiss National Science Foundation through FNS Grant [200021-149847]; French state funds [ANR-13-IS04-0006-01]; Investissements dAvenir programme [ANR-11-IDEX-0004-02]; Grand Equipement National de Calcul Intensif French National Supercomputing Facility [x2013091387]

Tillgänglig från: 2015-07-31 Skapad: 2015-07-31 Senast uppdaterad: 2017-12-04

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