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Dielectric Spectroscopy at High Frequencies on Glass Forming Liquids

Published online by Cambridge University Press:  10 February 2011

P. Lunkenhemer ,
A. Pimenov ,
M. Dressel ,
B. Gorshunov ,
U. Schneider ,
B. Schiener ,
R. Böhmer  and
A. Loedl
P. Lunkenhemer
Affiliation:
Experimentalphysik V, Universität Augsburg, Universitätsstr. 2, D-86135 Augsburg, Germany
A. Pimenov
Affiliation:
Experimentalphysik V, Universität Augsburg, Universitätsstr. 2, D-86135 Augsburg, Germany
M. Dressel
Affiliation:
Experimentalphysik V, Universität Augsburg, Universitätsstr. 2, D-86135 Augsburg, Germany
B. Gorshunov
Affiliation:
Experimentalphysik V, Universität Augsburg, Universitätsstr. 2, D-86135 Augsburg, Germany
U. Schneider
Affiliation:
Experimentalphysik V, Universität Augsburg, Universitätsstr. 2, D-86135 Augsburg, Germany
B. Schiener
Affiliation:
Inst. für Festkörperphysik, TH Darmstadt, Hochschulstr. 6, D-64289 Darmstadt, Germany
R. Böhmer
Affiliation:
Inst. für Festkörperphysik, TH Darmstadt, Hochschulstr. 6, D-64289 Darmstadt, Germany
A. Loedl
Affiliation:
Experimentalphysik V, Universität Augsburg, Universitätsstr. 2, D-86135 Augsburg, Germany
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Abstract

Dielectric spectroscopy up to 950 GHz has been performed on various glass formers as glycerol, propylene-carbonate, and Salol. Special attention is given to the dielectric loss, ε″, in the crossover regime from the a-relaxation to the far-infrared (FIR) response where it can be directly compared to the dynamic susceptibilities obtained by neutron and light scattering techniques. We observe a minimum in ε″(ν) at high frequencies which cannot be explained by a simple transition from a-relaxation peak to the FIR bands but has to be attributed to additional fast processes. In all materials investigated, ε″(ν) increases significantly sublinear above the minimum. The ratio of the intensity of the α-process and the fast process as determined from our dielectric experiments is significantly higher compared to the results from the scattering experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 455: Symposium T – Glasses and Glass Formers–Current Issues , 1996 , 47
Copyright
Copyright © Materials Research Society 1997

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