Regensburg 2007 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 13: Glass I (joint session with DF)

DY 13.2: Vortrag

Dienstag, 27. März 2007, 10:15–10:30, H23

Fast β-relaxation of Na in Na₂O-xB₂O₃ melts — •Florian Kargl¹, Andreas Meyer², and Michael Marek Koza³ — ¹Physik Department E13, TU München, 85748 Garching, Present Address: Department of Applied Physics, Chalmers University of Technology, 41296 Göteborg, Schweden — ²Physik Department E13, TU München, 85748 Garching, Permanent Address: Institut für Raumsimulation, DLR, 51147 Köln — ³Institut Laue-Langevin, 38042 Grenoble, France

We report on a fast β-relaxation process in a network-glass forming system that is up to the melt a fast-ion conductor. The process is evidenced by means of quasielastic neutron scattering [1]. The data are analysed in the framework of the mode-coupling theory (MCT) of the liquid to glass transition [2]. It is shown that this fast β-relaxation process, that can consistently be described within the framework of this theory, prepares the α-relaxation of the fast diffusing Na ions. We discuss the q- and T-dependence of the relevant parameters of the β-scaling law of the MCT and its dependence on Na concentration.

[1] F. Kargl, A. Meyer, M. M. Koza (submitted).

[2] W. Götze, J. Phys.: Condens. Matter 2, 8485 (1990).