The low frequency phonons dynamics in supercooled LiCl, 6H2O

We report the results of a series of ultrasound, Brillouin scattering, and optical heterodyne detected transient grating experiments performed on a LiCl, 6H2O solution from room temperature down to the vicinity of its liquid-glass transition, Tg∼138 K. Down to T∼215 K, the supercooled liquid has a b...

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Bibliographic Details
Published in:The Journal of chemical physics 2009-09, Vol.131 (12)
Main Authors: Gallina, M. E., Bove, L., Dreyfus, C., Polian, A., Bonello, B., Cucini, R., Taschin, A., Torre, R., Pick, R. M.
Format: Article
Language:English
Subjects:
Condensed Matter
Materials Science
Physics
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Summary:We report the results of a series of ultrasound, Brillouin scattering, and optical heterodyne detected transient grating experiments performed on a LiCl, 6H2O solution from room temperature down to the vicinity of its liquid-glass transition, Tg∼138 K. Down to T∼215 K, the supercooled liquid has a behavior similar to what is expected for supercooled water: its zero frequency sound velocity, C0, continuously decreases while the corresponding infinite frequency velocity, C∞, sharply increases, reflecting the increasing importance of H bonding when temperature is lowered. Below 215 K, specific aspects of the solution, presumably related to the role of the Li+ and Cl− ions, modify the thermal behavior of C0, while a β relaxation process also appears and couples to the sound propagation. The origin of those two effects is briefly discussed.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.3197851