Liquidlike Behavior of Supercritical Fluids

F. Gorelli, M. Santoro, T. Scopigno, M. Krisch, and G. Ruocco
Phys. Rev. Lett. 97, 245702 – Published 13 December 2006

Abstract

The high frequency dynamics of fluid oxygen has been investigated by inelastic x-ray scattering, at high pressures and room temperature. In spite of the markedly supercritical conditions (T2Tc, P>102Pc), the sound velocity exceeds the hydrodynamic value of about 20%, a feature which is the fingerprint of liquidlike dynamics. The comparison of the present results with literature data obtained in several fluids allow us to identify the extrapolation of the liquid-vapor-coexistence line in the (P/Pc, T/Tc) plane as the relevant edge between liquidlike and gaslike dynamics. More interestingly, this extrapolation is very close to the non-metal-metal transition in hot dense fluids, at pressure and temperature values as obtained by shock wave experiments. This result points to the existence of a connection between structural modifications and transport properties in dense fluids.

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  • Received 6 June 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.245702

©2006 American Physical Society

Authors & Affiliations

F. Gorelli1,2, M. Santoro1,2, T. Scopigno1,*, M. Krisch3, and G. Ruocco4,1

  • 1Research Center SOFT-INFM-CNR, Università di Roma “La Sapienza”, I-00185, Roma, Italy
  • 2LENS, Via N. Carrara 1, I-50019 Sesto Fiorentino, Firenze, Italy
  • 3European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France
  • 4Dipartimento di Fisica, Universitá di Roma “La Sapienza”, 00185 Roma, Italy

  • *Electronic address: tullio.scopigno@phys.uniroma1.it

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Vol. 97, Iss. 24 — 15 December 2006

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