Glassy Dynamics Under Superhigh Pressure

Abstract

Nearly all glass-forming liquids feature, along with the structural alpha-relaxation process, a faster secondary process (beta-relaxation), whose nature belongs to the great mysteries of glass physics. However, for some of these liquids, no well-pronounced secondary relaxation is observed. A prominent example is the archetypical glass-forming liquid glycerol. In the present work, by performing dielectric spectroscopy under superhigh pressures up to 6 GPa, we show that in glycerol a significant secondary relaxation peak appears in the dielectric loss at P > 3 GPa. We identify this beta-relaxation to be of Johari-Goldstein type and discuss its relation to the excess wing. We provide evidence for a smooth but significant increase of glass-transition temperature and fragility on increasing pressure.

5 pages, 5 figures, final version with minor changes according to referee demands and corrected Figs 1 and 2

References in corpus (2)

• The Excess Wing in the Dielectric Loss of Glass-Formers: A Johari-Goldstein beta-Relaxation?
• Idealized glass transitions under pressure: dynamics versus thermodynamics

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• Intra- and Intermolecular Inhomogeneities in the Course of Glassy Densification of Polyalcohols
• Coupling between structural relaxation and diffusion in glass-forming liquids under pressure variation
• Ions in glass forming glycerol: Close correlation of alpha and fast beta relaxation
• Determination of Young's modulus of active pharmaceutical ingredients by relaxation dynamics at elevated pressures
• Dielectric constant of disordered phases of the smallest monoalcohols : evidence for the hindered plastic crystal phase
• Phenomenological model of supercooled liquid as a possible resolution of the Kauzmann paradox
• Mean-squared Energy Difference for Exploring Potential Energy Landscapes of Supercooled Liquids
• Competing Supramolecular Structures: Dielectric and Rheological Spectroscopy on Glycerol/Propanol Mixtures