It has been known for decades that certain aqueous salt solutions of LiCl and LiBr readily form glasses when cooled to below approximate to 160 K. This fact has recently been exploited to produce a "salty" high-pressure ice form: When the glass is compressed at low temperatures to pressures higher than 4 GPa and subsequently warmed, it crystallizes into ice VII with the ionic species trapped inside the ice lattice. Here we report the extreme limit of salt incorporation into ice VII, using high pressure neutron diffraction and molecular dynamics simulations. We show that high-pressure crystallisation of aqueous solutions of LiCl center dot RH2O and LiBr center dot RH2O with R = 5.6 leads to solids with strongly expanded volume, a destruction of the hydrogen-bond network with an isotropic distribution of water-dipole moments, as well as a crystal-to-amorphous transition on decompression. This highly unusual behaviour constitutes an interesting pathway from a glass to a crystal where translational periodicity is restored but the rotational degrees of freedom remaining completely random

Ice VII from aqueous salt solutions: From a glass to a crystal with broken H-bonds / Klotz, S.; Komatsu, K.; Pietrucci, F.; Kagi, H.; Ludl, A. -A.; Machida, S.; Hattori, T.; Sano-Furukawa, A.; Bove, L. E.. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - ELETTRONICO. - 6:1(2016), pp. 1-8. [10.1038/srep32040]

Ice VII from aqueous salt solutions: From a glass to a crystal with broken H-bonds

Pietrucci, F.;Bove, L. E.
2016

Abstract

It has been known for decades that certain aqueous salt solutions of LiCl and LiBr readily form glasses when cooled to below approximate to 160 K. This fact has recently been exploited to produce a "salty" high-pressure ice form: When the glass is compressed at low temperatures to pressures higher than 4 GPa and subsequently warmed, it crystallizes into ice VII with the ionic species trapped inside the ice lattice. Here we report the extreme limit of salt incorporation into ice VII, using high pressure neutron diffraction and molecular dynamics simulations. We show that high-pressure crystallisation of aqueous solutions of LiCl center dot RH2O and LiBr center dot RH2O with R = 5.6 leads to solids with strongly expanded volume, a destruction of the hydrogen-bond network with an isotropic distribution of water-dipole moments, as well as a crystal-to-amorphous transition on decompression. This highly unusual behaviour constitutes an interesting pathway from a glass to a crystal where translational periodicity is restored but the rotational degrees of freedom remaining completely random
2016
Multidisciplinary
01 Pubblicazione su rivista::01a Articolo in rivista
Ice VII from aqueous salt solutions: From a glass to a crystal with broken H-bonds / Klotz, S.; Komatsu, K.; Pietrucci, F.; Kagi, H.; Ludl, A. -A.; Machida, S.; Hattori, T.; Sano-Furukawa, A.; Bove, L. E.. - In: SCIENTIFIC REPORTS. - ISSN 2045-2322. - ELETTRONICO. - 6:1(2016), pp. 1-8. [10.1038/srep32040]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1081360
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