The low frequency phonons dynamics in supercooled LiCl, 6H2O
Year: 2009
Authors: Gallina ME., Bove L., Dreyfus C., Polian A., Bonello B., Cucini R., Taschin A., Torre R., Pick R.M.
Autors Affiliation: Univ Perugia, Dipartimento Chim, I-06100 Perugia, Italy; Univ Paris 06, IMPMC, CNRS UMR 7590, F-75015 Paris, France; Univ Paris 06, INSP, CNRS UMR 7588, F-75015 Paris, France; Univ Florence, LENS & Dip Fis, I-50019 Sesto Fiorentino, Italy.
Abstract: We report the results of a series of ultrasound, Brillouin scattering, and optical heterodyne detected transient grating experiments performed on a LiCl, 6H(2)O solution from room temperature down to the vicinity of its liquid-glass transition, T-g similar to 138 K. Down to T similar to 215 K, the supercooled liquid has a behavior similar to what is expected for supercooled water: its zero frequency sound velocity, C-0, continuously decreases while the corresponding infinite frequency velocity, C-infinity, 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 C-0, while a beta relaxation process also appears and couples to the sound propagation. The origin of those two effects is briefly discussed.
Journal/Review: JOURNAL OF CHEMICAL PHYSICS
Volume: 131 (12) Pages from: 124504-1 to: 124504-10
KeyWords: Liquid-glass-transition; Brillouin-scattering; Structural Relaxation; Light-scattering; WaterDOI: 10.1063/1.3197851Citations: 21data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2024-11-17References taken from IsiWeb of Knowledge: (subscribers only)