NDLI: Two glass transitions in ethanol: a comparative dielectric relaxation study of the supercooled liquid and the plastic crystal

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Two glass transitions in ethanol: a comparative dielectric relaxation study of the supercooled liquid and the plastic crystal

Content Provider	Scilit
Author	Benkhof, S. Kudlik, A. Blochowicz, T. Rössler, E.
Copyright Year	1998
Description	Journal: Journal of Physics: Condensed Matter Ethanol is known to form two different kinds of glassy state, namely a structural glass and a glassy crystal, both showing the same glass transition temperature . The molecular dynamics in the different phases (supercooled liquid/plastic crystal) and during the corresponding phase transition is studied by dielectric spectroscopy in the frequency range (30 K-250 K). Extracting the time constant, width parameter and relaxation strength of the main relaxation (the -process), very similar dielectric loss is found in both phases, including also the high-frequency wing. Comparing the temperature dependence of the time constants , the plastic crystal exhibits a less fragile behaviour. Additionally, a secondary relaxation is detected, again essentially the same in the two glassy states. We conclude that the motional mechanisms probed in the plastic crystal and in the supercooled liquid state are very similar.
Related Links	http://iopscience.iop.org/article/10.1088/0953-8984/10/37/005/pdf
Ending Page	8171
Page Count	17
Starting Page	8155
ISSN	09538984
e-ISSN	1361648X
DOI	10.1088/0953-8984/10/37/005
Journal	Journal of Physics: Condensed Matter
Issue Number	37
Volume Number	10
Language	English
Publisher	IOP Publishing
Publisher Date	1998-09-21
Access Restriction	Open
Subject Keyword	Journal: Journal of Physics: Condensed Matter Atomic, Molecular and Chemical Physics Dielectric Spectroscopy Molecular Dynamic Supercooled Liquid Phase Transition Time Constant Dielectric Loss High Frequency Glass Transition Temperature Glass Transition
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Materials Science

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