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

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print)

DOI:https://doi.org/10.1103/PHYSREVE.82.021508· OSTI ID:21464479

Niss, Kristine ^[1]; Dalle-Ferrier, Cecile ^[1]; Frick, Bernhard; Russo, Daniela ^[2]; Dyre, Jeppe ^[3]; Alba-Simionesco, Christiane ^[1]

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1. Laboratoire de Chimie Physique, Batiment 349, Universite Paris-Sud, F-91405 Orsay (France)
2. Institut Laue-Langevin, F-38042 Grenoble (France)
3. DNRF Centre 'Glass and Time', IMFUFA, Department of Sciences, Roskilde University, Postbox 260, DK-4000 Roskilde (Denmark)

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 {approx}4 ns, 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.

• OSTI ID: 21464479
• Journal Information: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics (Print), Vol. 82, Issue 2; Other Information: DOI: 10.1103/PhysRevE.82.021508; (c) 2010 The American Physical Society; ISSN 1539-3755
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CORRELATIONS
ELASTICITY
GLASS
LIQUIDS
MATHEMATICAL MODELS
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
RELAXATION
TEMPERATURE DEPENDENCE
COHERENT SCATTERING
DIFFRACTION
FLUIDS
MECHANICAL PROPERTIES
SCATTERING