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Ruiz, G.N.; Bove, L.E.; Corti, H.R.; Loerting, T. "Pressure-induced transformations in LiCl-H2O at 77 K" (2014) Physical Chemistry Chemical Physics. 16(34):18553-18562
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Abstract:

A systematic study of the properties of high-density amorphous ice (HDA) in the presence of increasing amounts of salt is missing, especially because it is challenging to avoid ice crystallization upon cooling the pressurized liquid. In order to be able to study HDA also in the presence of small amounts of salt, we have investigated the transformation behaviour of quenched aqueous LiCl solutions (mole fraction x < 0.25) upon pressurization in a piston-cylinder setup at 77 K. The sample properties were characterized by in situ dilatometry under high pressure conditions and after recovery by ex situ powder X-ray diffraction (XRD) and differential scanning calorimetry (DSC) at ambient pressure. Two regimes can be identified, with a rather sharp switch at about x = 0.12. At x < 0.12 the samples show the phenomenology also known for pure water samples. They are composed mainly of hexagonal ice (Ih) and experience pressure-induced amorphization to HDA at P > 1 GPa. The observed densification is consistent with the idea that a freeze concentrated LiCl solution of x = 0.14 (R = 6) segregates, which transforms to the glassy state upon cooling, and that the densification is only due to the Ih→ HDA transition. Also the XRD patterns and DSC scans are almost unaffected by the presence of the segregated glassy LiCl solution. Upon heating at ambient pressure HDA experiences the polyamorphic transition to low-density amorphous ice (LDA) at ∼120 K, even at x∼ 0.10. Based on the latent heat evolved in the transition we suggest that almost all water in the sample transforms to an LDA-like state, even the water in the vicinity of the ions. The glassy LiCl solution acts as a spectator that does not shift the transformation temperature significantly and experiences a glass-to-liquid transition at ∼140 K prior to the crystallization to cubic ice. By contrast, at x > 0.12 the phenomenology completely changes and is now dominated by the salt. Hexagonal ice no longer forms upon quenching the LiCl solution, but instead LDA forms. A broad pressure-induced transformation at >0.6 GPa can be attributed to the densification of LDA, the glassy LiCl solution and/or glassy hydrates. © the Partner Organisations 2014.

Registro:

Documento: Artículo
Título:Pressure-induced transformations in LiCl-H2O at 77 K
Autor:Ruiz, G.N.; Bove, L.E.; Corti, H.R.; Loerting, T.
Filiación:Instituto de Química Física de los Materiales, Medio Ambiente y Energía (INQUIMAE-CONICET), Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, (1428), Buenos Aires, Argentina
Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, Innsbruck, 6020, Austria
Institut de Minéralogie, Physique des Matériaux, Cosmochimie (IMPMC) - UMR CNRS 7590, UPMC Université P. & M. Curie, Sorbonne Universités, 4 Place Jussieu, Paris, F-75005, France
EPSL, Institute of Condensed Matter Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 3, Lausanne, CH-1015, Switzerland
Departamento de Física de la Materia Condensada, Comisión Nacional de Energía Atómica, Avda. General Paz 1499 (1650) San Martín, Buenos Aires, Argentina
Año:2014
Volumen:16
Número:34
Página de inicio:18553
Página de fin:18562
DOI: http://dx.doi.org/10.1039/c4cp01786b
Título revista:Physical Chemistry Chemical Physics
Título revista abreviado:Phys. Chem. Chem. Phys.
ISSN:14639076
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14639076_v16_n34_p18553_Ruiz

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Citas:

---------- APA ----------
Ruiz, G.N., Bove, L.E., Corti, H.R. & Loerting, T. (2014) . Pressure-induced transformations in LiCl-H2O at 77 K. Physical Chemistry Chemical Physics, 16(34), 18553-18562.
http://dx.doi.org/10.1039/c4cp01786b
---------- CHICAGO ----------
Ruiz, G.N., Bove, L.E., Corti, H.R., Loerting, T. "Pressure-induced transformations in LiCl-H2O at 77 K" . Physical Chemistry Chemical Physics 16, no. 34 (2014) : 18553-18562.
http://dx.doi.org/10.1039/c4cp01786b
---------- MLA ----------
Ruiz, G.N., Bove, L.E., Corti, H.R., Loerting, T. "Pressure-induced transformations in LiCl-H2O at 77 K" . Physical Chemistry Chemical Physics, vol. 16, no. 34, 2014, pp. 18553-18562.
http://dx.doi.org/10.1039/c4cp01786b
---------- VANCOUVER ----------
Ruiz, G.N., Bove, L.E., Corti, H.R., Loerting, T. Pressure-induced transformations in LiCl-H2O at 77 K. Phys. Chem. Chem. Phys. 2014;16(34):18553-18562.
http://dx.doi.org/10.1039/c4cp01786b