Effect of salt on the H-bond symmetrization in ice

The richness of the phase diagram of water reduces drastically atvery high pressures where only two molecular phases, protondisorderedice VII and proton-ordered ice VIII, are known. Bothphases transform to the centered hydrogen bond atomic phase iceX above about 60 GPa, i.e., at pressures experience...

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Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2015, Vol.112 (27)
Main Authors: Bove, Livia Eleonora, Gaal, Richard, Raza, Zamaan, Ludl, Adriaan-Alexander, Klotz, Stefan, Saitta, Antonino Marco, Goncharov, Alexander F., Gillet, Philippe
Format: Article
Language:English
Subjects:
Physics
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Summary:The richness of the phase diagram of water reduces drastically atvery high pressures where only two molecular phases, protondisorderedice VII and proton-ordered ice VIII, are known. Bothphases transform to the centered hydrogen bond atomic phase iceX above about 60 GPa, i.e., at pressures experienced in the interiorof large ice bodies in the universe, such as Saturn and Neptune,where nonmolecular ice is thought to be the most abundant phaseof water. In this work, we investigate, by Raman spectroscopy upto megabar pressures and ab initio simulations, how the transformationof ice VII in ice X is affected by the presence of saltinclusions in the ice lattice. Considerable amounts of salt can beincluded in ice VII structure under pressure via rock–ice interactionat depth and processes occurring during planetary accretion. Ourstudy reveals that the presence of salt hinders proton order andhydrogen bond symmetrization, and pushes ice VII to ice X transformationto higher and higher pressures as the concentration ofsalt is increased.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1502438112/-/DCSupplemental