Dresden 2006 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 5: Glass I (together with division ‘Dynamics and Statistical Physics’ [DY])

DF 5.5: Vortrag

Dienstag, 28. März 2006, 11:10–11:30, M{\"U}L Elch

Glasses, Clusters, and Philosophy — •Andreas Reiser, Gernot Kasper, Siegfried Hunklinger, and Christian Enss — Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg

Dielectric relaxation studies can reveal information on structural or chemical processes in liquids, soft matter, and partly crystalline or amorphous solids. Glass formers can belong to all of these groups, depending on the external control parameters temperature, pressure, and more generally on the thermodynamic present and history. We have measured the dielectric permittivity of several prototypical organic glass formers as a function of frequency, temperature, and pressure. Isobaric, isothermal and isochoric routes in the temperature-pressure plane were taken. We show basic scaling properties of the dielectric function. For data interpretation a cluster-based approach is discussed with respect to crystallization.