Scaling of broadband dielectric data of glass-forming liquids and plastic crystals
U. Schneider - R. Brand - P. Lunkenheimer - A. Loidl
Experimentalphysik V, Universität Augsburg, D-86135
Received 14 June 1999 and Received in final form 4 October 1999
The Nagel scaling and the modified scaling procedure proposed recently by Dendzik et al. have been applied to broadband dielectric data on two glass-forming liquids (glycerol and propylene carbonate) and three plastic crystals (ortho-carborane, meta-carborane, and 1-cyano-adamantane). Our data extend the upper limit of the abscissa range to considerably higher values than in previously published analyses. At the highest frequencies investigated, deviations from a single master curve show up which are most pronounced in the Dendzik scaling plot. The loss curves of the plastic crystals do not scale in the Nagel plot, but they fall onto a separate master curve in the Dendzik plot. In addition, we address the question of a possible divergence of the static susceptibility near the Vogel-Fulcher temperature. For this purpose, the low-temperature evolution of the high-frequency wing of the dielectric loss peaks is investigated in detail. No convincing proof for such a divergence can be deduced from the present broadband data.
77.22.Gm Dielectric loss and relaxation - 64.70.Pf Glass transitions
Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag