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arXiv · 0911.3496

Glassy Dynamics Under Superhigh Pressure

A. A. Pronin·M. V. Kondrin·A. G. Lyapin·V. V. Brazhkin·A. A. Volkov·P. Lunkenheimer·A. Loidl
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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.

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A. A. Pronin, M. V. Kondrin, A. G. Lyapin, V. V. Brazhkin, A. A. Volkov, P. Lunkenheimer, A. Loidl. 2009-11-18. Glassy Dynamics Under Superhigh Pressure. https://doi.org/10.1103/physreve.81.041503

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