Dresden 2020 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 56: Poster: Glasses; Granular Matter; Brownian Motion and Anomalous Diffusion
DY 56.2: Poster
Thursday, March 19, 2020, 15:00–18:00, P1A
Analytical theory for predicting variations of activation energies in mixed glass former glasses — •Julian Fischer, Marco Bosi, and Philipp Maass — Fachbereich Physik, Universität Osnabrück, Germany
The mixed glass former effect manifests itself in a nonadditive behaviour of physical and chemical properties upon mixing of two or more different glass formers in ion-conducting glasses[1]. Most striking is the behaviour of conductivity activation energies. They can exhibit minima at certain mixing ratios that at room temperature lead to enhancements of ionic conductivities by several orders of magnitude compared to the respective glasses containing only one of the network formers.
We present an analytical approach for modeling the variation of conductivity activation energies Ea(x) with the glass former mixing ratio x. This approach is based on the assumption that changes of the free energy landscape for the long-range ion transport are governed by changes of the concentration of glass former units[2].
Theoretical results obtained by adjustment of only one parameter are in surprisingly good agreement with experimental findings.
[1] M.D. Ingram, Phys. Chem. Glasses 28, 215 (1987).
[2] M. Schuch, C. Trott, P. Maass, RSC Adv. 1, 1370 (2011).