Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Fluids and Glasses I

CPP 37.3: Vortrag

Mittwoch, 22. März 2017, 10:45–11:00, ZEU 255

Dielectric Spectroscopy Below the Glass Temperature — •Korbinian Geirhos, Peter Lunkenheimer, and Alois Loidl — Experimental Physics V, University of Augsburg, Germany

The dynamics of glassy matter above the glass temperature (Tg) is already extensively studied by dielectric spectroscopy in a broad frequency and temperature range. Dielectric data of glasses below Tg, however, are rather scarce. The dielectric spectra of glass formers above Tg are dominated by relaxation processes. These contributions may hide additional processes, which are proposed by different models, like the "Nearly Constant Loss" of the Coupling Model [1] or the fast β-Process of the Extended Mode Coupling Theory [2]. Below Tg, however, the main relaxation features are shifted out of the experimental frequency window. As a consequence, possible additional processes can be observed and studied. For this purpose, we provide temperature- and frequency-dependent dielectric data of different glass formers down to temperatures of 4 K.
K. L. Ngai, J. Phys.: Condens. Matter 15, 1107 (2003). [2] W. Götze et al., Rep. Prog. Phys. 55, 241 (1992).

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