On the optimal conditions for the homogeneous nucleation of cubic ice from concentrated solutions of lithium chloride-deuterium oxide

Elarby-Aquizerat, A.; Jal, J. F.; Ferradou, C.; Dupuy, J.; Chieux, P.; Wright, A. T. B.

doi:10.1021/j100244a039

Cited by 20 publications

(4 citation statements)

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“…At about 185 K the amorphous NaClÁ10.2D 2 O solution dissociates into pure hexagonal ice and sodium chloride dideuterate. 23 This behaviour mirrors that of lithium chloride solutions, as discussed in Elarby-Aouizerat et al 32 The high-pressure diffraction experiments were carried out at the time-of-flight PEARL beamline of the ISIS Facility pulsed neutron source in Didcot (United Kingdom). 33 The pellets of pre-compressed powder (see Section 2.1 for details) were split into two hemispheres and a small piece of lead was placed in between them to serve as a pressure calibrant.…”

Section: Neutron Diffraction Experimentssupporting

confidence: 54%

“…The absence of peaks associated with hydrates or salt below 190 K indicates that the vitrified solution matrix remains metastable until the concentrated metastable liquid segregates into pure hexagonal ice and a salt hydrate. 17,32 Upon compression at 80 K and annealing under highpressure the structure densifies continuously, in contrast to pure water where a stepwise change in the density was recorded due to the transformation of LDA into HDA at 0.55 GPa. 46,47 In the present case the position of the first diffraction peak shifts continuously from 2.08 Å À1 at low pressure to 2.35 Å À1 at 4 GPa, and no other modification is observed in the static structure factor.…”

Section: Resultsmentioning

confidence: 99%

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Structural characterization of eutectic aqueous NaCl solutions under variable temperature and pressure conditions

Ludl

Bove

Saitta

et al. 2015

Phys. Chem. Chem. Phys.

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Structural characterization of eutectic aqueous NaCl solutions under variable temperature and pressure conditions †The structure of amorphous NaCl solutions produced by fast quenching is studied as a function of pressure, up to 4 GPa, by combined neutron diffraction experiments and classical molecular dynamics simulations. Similarly to LiCl solutions the system amorphizes at ambient pressure in a dense phase structurally similar to the e-HDA phase in pure water. The measurement of the static structure factor as a function of pressure allowed us to validate a new polarizable force field developed by Tazi et al., 2012, never tested under non-ambient conditions.We infer from simulations that the hydration shells of Na + cations form well defined octahedra composed of both H 2 O molecules and Cl À anions at low pressure. These octahedra are gradually broken by the seventh neighbour moving into the shell of first neighbours yielding an irregular geometry. In contrast to LiCl solutions and pure water, the system does not show a polyamorphic transition under pressure. This confirms that the existence of polyamorphism relies on the tetrahedral structure of water molecules, which is broken here.

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Section: Neutron Diffraction Experimentssupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Structural characterization of eutectic aqueous NaCl solutions under variable temperature and pressure conditions

Ludl

Bove

Saitta

et al. 2015

Phys. Chem. Chem. Phys.

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“…When rapidly cooled, a dilute solution of electrolyte is expected to freeze into a solid with almost the same solvation shell structure as in the liquid state. It should be noted, however, that a phase separation is apt to occur in concentrated solid solutions [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Raman study of concentrated ethanol-LiCl solid solutions

Ishioka¹,

Hase²

1993

J. Phys.: Condens. Matter

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R a m spectra were measured for ethanol solid solutions of LiCl of various concentrations between 5 and 77 K. With increasing LiCl concenbation, the O-H stretching and the intermolecular vibrational bands changed abruptly f" broad bands to sharp peaks at a mole ratio n 2 E of EtOH to LiU. This spectral change is explained by a phase transition f" glass to a crystalline hydrate-like cluster. For the solutions 5 n < 8, a marked spectral change was observed. at temperatures around 68 K. in the 0-H saetching bands, and was ascribed to a lowering of the symmetry of the crystal suucture due to thermal m n W o n on decreasing temperature. Other solid solutions of alkali halides also showed similar spectral changes with alkali halide concenuation. except for methanol solutions, but none of them showed any spechal changes on decreasing temperature. These resulfs imply that crystalliration commonly takm place in rapidly cooled concentrated solutions of alkali halides, and that the ethanol salid solution of LiCl has a unique crystal s t ~c t u r e which causes the spectral chanp with temperature.

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“…In this region they typically show a good ability to form glasses when cooled. This is the case for LiCl-water solutions with concentration close to the eutectic [1,6]. The composition/temperature phase diagram of solutions, be they metal alloys or salts in water, usually exhibits a eutectic point (E), which is the point of lowest temperature at which the liquid is stable.…”

Section: Amorphizing Solutionsmentioning

confidence: 99%