1. Mixed Barrier Model for the Mixed Glass Former Effect in Ion Conducting Glasses
- Author
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Christian R. Müller, Steve W. Martin, Philipp Maass, and Michael Schuch
- Subjects
Condensed Matter::Soft Condensed Matter ,Superposition principle ,Materials science ,Conductivity activation energy ,Chemical physics ,Spatial clustering ,Mixing ratio ,General Physics and Astronomy ,Conductivity spectra ,Ionic conductivity ,Condensed Matter::Disordered Systems and Neural Networks ,Mixing (physics) ,Ion - Abstract
Mixing two types of glass formers in ion conducting glasses can be exploited to lower conductivity activation energy and thereby increasing the ionic conductivity, a phenomenon known as the mixed glass former effect (MGFE). We develop a model for this MGFE, where activation barriers for individual ion jumps get lowered in inhomogeneous environments containing both types of network forming units. Fits of the model to experimental data allow one to estimate the strength of the barrier reduction, and they indicate a spatial clustering of the two types of network formers. The model predicts a time-temperature superposition of conductivity spectra onto a common master curve independent of the mixing ratio.
- Published
- 2009