Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2009-11-18
Phys. Rev. E 81, 041503 (2010)
Physics
Condensed Matter
Disordered Systems and Neural Networks
5 pages, 5 figures, final version with minor changes according to referee demands and corrected Figs 1 and 2
Scientific paper
10.1103/PhysRevE.81.041503
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.
Brazhkin Vadim V.
Kondrin M. V.
Loidl Alois
Lunkenheimer P.
Lyapin A. G.
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