Berlin 2001 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 7: Dynamics of Molecular Systems
CPP 7.2: Vortrag
Dienstag, 3. April 2001, 17:05–17:25, 112
If the glass transition were a phase transition: An unconventional view on the glass transition of canonical glasses — •Jörg Baller1, Andrä le Coutre1, Malte Henkel2, and Jan Kristian Krüger1 — 1Universität des Saarlandes, Fachrichtung 7.2 Experimentalphysik, Bau 38 2.OG , Postfach 151150, 66041 Saarbrücken — 2Laboratoire Européen de Recherche Universitaire Sarre-Lorraine, Laboratoire de Physique des Matériaux, Université Henri Poincaré Nancy 1, B.P. 239, F-54506 Vandœuvre lès Nancy Cedex, France
Thinking of the glass transition as a phase transition, it is desirable to describe it in terms of an order or disorder parameter which vanishes at the glass transition temperature Tg. We present measurements as well as a phenomenological theory supporting the idea of a disorder parameter which describes the behaviour of phenomenological properties around Tg. The Vogel-Fulcher-Tammann law for the temperature dependence of intrinsic relaxtion times which can be found with different measurement techniques well above Tg could be described as a result of the crossing of two different Arrhenius-like relaxation processes.