Regensburg 2004 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 29: Glasses II (joint session DF/DY)

DY 29.5: Vortrag

Dienstag, 9. März 2004, 15:45–16:00, H23

Molecular Dynamics in Phosphate Glasses — •Oliver Baldus and Ernst Rössler — Lehrstuhl für Experimentalphysik II, Universität Bayreuth, Universitätsstr. 30, 95440 Bayreuth

The molecular dynamics of the glass formers tricresylphosphate (TCP), triphenylphosphite (TPP) and mixtures with polystyrene are investigated by NMR methods. The observed deviations from the KWW-behaviour of the relaxation function obtained in stimulated echo measurements are explained. Further it will be discussed whether those deviations are a sign of the so called wing phenomenon that is seen in dielectric spectra and how far the measurements are influenced by limitations of the stimulated echo method. Restrictions of the stimulated echo method are shown by simulations.