Composition dependence of glass transition temperature and fragility. I. A topological model incorporating temperature-dependent constraints

We present a topological model for the composition dependence of glass transition temperature and fragility. Whereas previous topological models are derived for zero temperature conditions, our approach incorporates the concept of temperature-dependent constraints that freeze in as the system is coo...

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Veröffentlicht in:The Journal of chemical physics 2009-03, Vol.130 (9), p.094503-094503
Hauptverfasser: Gupta, Prabhat K, Mauro, John C
Format: Artikel
Sprache:eng
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Zusammenfassung:We present a topological model for the composition dependence of glass transition temperature and fragility. Whereas previous topological models are derived for zero temperature conditions, our approach incorporates the concept of temperature-dependent constraints that freeze in as the system is cooled from high temperature. Combining this notion of temperature-dependent constraints with the Adam-Gibbs model of viscosity, we derive an analytical expression for the scaling of glass transition temperature and fragility in the binary Ge(x)Se(1-x) system. In the range of 0
ISSN:0021-9606
1089-7690
DOI:10.1063/1.3077168