Berlin 2005 – wissenschaftliches Programm

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DF: Dielektrische Festkörper

DF 8: Gl
äser II (gemeinsam mit FV DY)

DF 8.10: Vortrag

Montag, 7. März 2005, 17:00–17:15, TU A060

Temperature-volume scaling of small molecule organic glass formers — •Andreas Reiser, Gernot Kasper, Christian Enss und Siegfried Hunklinger — Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg

The use of pressure besides temperature as a further external variable allows a variety of approaches to the glass-formation phenomenon. We have investigated the prototypical small molecule organic glass formers meta-fluoroaniline, propylene carbonate and glycerol using dielectric spectroscopy and dilatometry under hydrostatic pressure up to 700  MPa. We show that the volume and temperature dependence of the α-relaxation of these glass formers can be described by a single scaling variable Γ:=1/(TV^w) with a material dependent parameter w and density independent fragilities.