Connection between slow and fast dynamics of molecular liquids around the glass transition

Kristine Niss, Cécile Dalle-Ferrier, Bernhard Frick, Daniela Russo, Jeppe Dyre, and Christiane Alba-Simionesco
Phys. Rev. E 82, 021508 – Published 19 August 2010

Abstract

The mean-square displacement (MSD) was measured by neutron scattering at various temperatures and pressures for a number of molecular glass-forming liquids. The MSD is invariant along the glass-transition line at the pressure studied, thus establishing an “intrinsic” Lindemann criterion for any given liquid. A one-to-one connection between the MSD’s temperature dependence and the liquid’s fragility is found when the MSD is evaluated on a time scale of 4ns, but does not hold when the MSD is evaluated at shorter times. The findings are discussed in terms of the elastic model and the role of relaxations, and the correlations between slow and fast dynamics are addressed.

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  • Received 14 October 2009

DOI:https://doi.org/10.1103/PhysRevE.82.021508

©2010 American Physical Society

Authors & Affiliations

Kristine Niss1,2, Cécile Dalle-Ferrier1, Bernhard Frick3, Daniela Russo3, Jeppe Dyre2, and Christiane Alba-Simionesco1,4

  • 1Laboratoire de Chimie Physique, Bâtiment 349, Université Paris-Sud, F-91405 Orsay, France
  • 2DNRF Centre “Glass and Time,” IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde, Denmark
  • 3Institut Laue-Langevin, F-38042 Grenoble, France
  • 4Laboratoire Léon Brillouin, UMR 12, CEA-CNRS, 91191-Gif-sur-Yvette, France

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Issue

Vol. 82, Iss. 2 — August 2010

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