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Effect of salt on the H-bond symmetrization in ice

Eleonora Bove, Livia (author)
University of Paris 06, France; Ecole Polytech Federal Lausanne, Switzerland
Gaal, Richard (author)
Ecole Polytech Federal Lausanne, Switzerland
Raza, Zamaan (author)
Linköpings universitet,Teoretisk Fysik,Tekniska fakulteten,University of Paris 06, France
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Ludl, Adriaan-Alexander (author)
University of Paris 06, France
Klotz, Stefan (author)
University of Paris 06, France
Marco Saitta, Antonino (author)
University of Paris 06, France
Goncharov, Alexander F. (author)
Carnegie Institute Science, DC 20015 USA
Gillet, Philippe (author)
Ecole Polytech Federal Lausanne, Switzerland
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 (creator_code:org_t)
2015-06-22
2015
English.
In: Proceedings of the National Academy of Sciences of the United States of America. - : National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 112:27, s. 8216-8220
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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.

Subject headings

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Keyword

salty ices; extreme conditions; ice bodies; H-bond symmetrization; proton quantum effects

Publication and Content Type

ref (subject category)
art (subject category)

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