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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.19: Poster

Montag, 7. März 2005, 15:30–18:00, Poster TU D

Vacancy model reproducing the most important features of the Mixed Alkali Effect — •Robby Peibst, Stephan Schott, and Philipp Maass — Institut für Physik, Technische Universität Ilmenau, Germany

The mixed alkali effect in glasses is a very impressing example of non-linear behaviour in disordered systems. Some deviations from a simple additive behaviour upon mixing of two types of mobile ions are hardly understood so far, e.g. the limiting slope behaviour of the diffusion constant and the height of the mixed internal friction peak. By taking into account the results of recent molecular dynamik simulations as well as cognitions of preceding own investigations, we present a plausible vacancy model which is able to explain also these key problems. Furthermore, we discuss several possiblities for a general approach to transport processes in dense disorderd systems.
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[2] J. Habasaki and Y. Hiwatari, Phys. Rev. B, in print
[3] Ph. Maass, J. Non-Cryst. Solids 255, 35 (1999)