The scaling of the dielectric and electric relaxation in two low molecular weight glass forming liquids

F. Stickel, F. Kremer and E.W. Fischer

Physica A: Statistical Mechanics and its Applications, 1993, vol. 201, issue 1, 318-321

Abstract: The scaling of the dielectric and electric relaxation in two low molecular weight glass forming systems (PDE=Phenolphtalein-dimethylether and KDE=Kresolphtalein-di-methylether) is studied in the frequency regime from 10-3 Hz to 109 Hz by use of broadband dielectric spectroscopy. For both the dielectric α-relaxation and the dc-conductivity the temperature dependence is characterised by a crossover (at a temperature TA) from an Arrhenius to a Vogel-Fulcher-Tammann law. Above TA the dc-conductivity (reflecting translational diffusion of mobile charge carriers) and the α-relaxation have the same temperature dependence. Below TA a decoupling is found in agreement with recent tracer diffusion experiments (M. Lohfink and H. Sillescu, in: Proc. of the 1st Tohwa University Int. Symp., Fukuoka, Japan, 4–8.11.1991, Am. Inst. Phys. Conf. Series). For the α-relaxation, the relaxation time distribution shows a pronounced temperature dependence below TA, while it is only weakly varying with temperature above TA.

Date: 1993
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:201:y:1993:i:1:p:318-321

DOI: 10.1016/0378-4371(93)90429-8

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