Analysis of sound velocity in supercoled H2O, D2O, and water–ethanol mixtures
1982; American Institute of Physics; Volume: 76; Issue: 7 Linguagem: Inglês
10.1063/1.443413
ISSN1520-9032
AutoresO. Conde, J. Teixeira, Pierre Papon,
Tópico(s)Phase Equilibria and Thermodynamics
ResumoMeasurements of the sound velocity c in water, heavy water, and water–ethanol mixtures have been carried out in a temperature range extending from room temperature to the supercooled region above -20 °C, by Brillouin light scattering technique. Pure H2O and D2O show a strong anomalous behavior which can be described by critical laws. The addition of ethanol to water decreases the importance of the anomalies, and the sound velocity c(T) is no longer described by critical laws. For some concentrations, a minimum in the curve c(T) is observed at low temperatures. The adiabatic compressibility is evaluated for all the samples and discussed for different theoretical models. Arguments are given in favor of a percolation model of supercooled water.
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