Dielectric spectroscopy on the plastically crystalline phase of cyanocyclohexane

Tschirwitz, C.; Benkhof, S.; Blochowicz, T.; Rössler, E.
October 2002
Journal of Chemical Physics;10/1/2002, Vol. 117 Issue 13, p6281
Academic Journal
Dielectric measurements (10[sup -2] - 10[sup 9] Hz) on plastically crystalline cyanocyclohexane reveal a glass transition where the rotational dynamics freezes at a vitrification temperature T[sub g] = 134 K. A full line-shape analysis of the dielectric loss spectra, which include a pronounced secondary relaxation contribution (β process) in addition to the main relaxation, is performed. We show that the rotational dynamics in cyanocyclohexane is very similar to that of supercooled liquids. In particular the secondary process of cyanocyclohexane exhibits the features characteristic of the Johari-Goldstein β relaxation known from structural glass formers.


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