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DY: Fachverband Dynamik und Statistische Physik

DY 55: Posters - Soft Matter, Glasses

DY 55.9: Poster

Donnerstag, 23. März 2017, 17:00–19:30, P1A

Theory for the activation energy in mixed glass former glasses — •Mohamad Alhamad and Philipp Maass — Universität Osnabrück, Fachbereich Physik, Barbarastraße 7, 49076 Osnabrück, Germany

Improved physical and electrochemical properties of glassy electrolytes can be achieved by mixing two glass former cat- or anions at constant mole fraction of the mobile cation. This effect is known as the mixed glass former effect. Optimized mixed glass former electrolytes are promising materials for developing next generation solid state batteries. Most important is the optimization of the ionic conductivity and its activation energy. Extending a previous approach [1], we present a theory that allows us to predict the dependence of the activation energy on the glass former mixing ratio based on the charge redistribution in the glassy network. This redistribution is caused by changes in the concentration of the various network forming units associated with the glass formers. The latter are modeled within a thermodynamic model and the resulting change of the activation energy by applying percolation theory. Application of the theory leads to excellent quantitative agreement with measurements for five different types of alkali conducting mixed glass former systems with mixing pairs B₂O₃/P₂O₅, GeS₂/PO_5/2, B₂O₃/Si₂O₄, B₂O₃/TeO₂, and PO_5/2/TeO₂.

[1] M. Schuch, C. Trott, P. Maass, RSC Adv. 1, 1370 (2011).