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DY: Dynamik und Statistische Physik
DY 36: Glasses II (joint session DF/DY)
DY 36.10: Talk
Monday, March 7, 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/(TVw) with a material dependent parameter w and density independent fragilities.