High-pressure viscoelastic properties and equation of state of liquids derived from Brillouin data

W. F. Oliver, C. A. Herbst, Stuart Lindsay, George Wolf

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Abstract

Brillouin scattering in an organic glass-forming liquid up to a pressure of 12 GPa is reported. The onset of the unrelaxed regime is indicated by a distinct maximum in the acoustic attenuation at a pressure P± above which weak shear modes are resolved. Sound velocity data are fitted in a self-consistent way which accounts for relaxation by combining the universal Vinet equation of state with an expression for the dynamical modulus. This analysis yields the pressure dependences of the relaxed and unrelaxed moduli, relaxation time, and density over the pressure range studied.

Original languageEnglish (US)
Pages (from-to)2795-2798
Number of pages4
JournalPhysical Review Letters
Volume67
Issue number20
DOIs
StatePublished - Jan 1 1991

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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