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Article Dans Une Revue Journal of Chemical Physics Année : 2009

The low frequency phonons dynamics in supercooled LiCl, 6H2O

Résumé

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, Tg138 K. Down to T215 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 relaxation process also appears and couples to the sound propagation. The origin of those two effects is briefly discussed
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Dates et versions

hal-00420921 , version 1 (30-09-2009)

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M. E. Gallina, L. Bove, C. Dreyfus, A. Polian, Bernard Bonello, et al.. The low frequency phonons dynamics in supercooled LiCl, 6H2O. Journal of Chemical Physics, 2009, 131, pp.124504. ⟨10.1063/1.3197851⟩. ⟨hal-00420921⟩
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