SuperArrhenius character of supercooled glass-forming liquids

We picture the viscosity and α-relaxation time of a supercooled liquid as Arrhenius-like at temperatures well above the melting point, and as superArrhenius, i.e., describable in terms of a temperature-dependent activation free energy, E( T ), at temperatures near the glass transition temperature, T...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1998-08, Vol.235, p.86-100
Main Authors: Kivelson, Daniel, Tarjus, Gilles
Format: Article
Language:English
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Summary:We picture the viscosity and α-relaxation time of a supercooled liquid as Arrhenius-like at temperatures well above the melting point, and as superArrhenius, i.e., describable in terms of a temperature-dependent activation free energy, E( T ), at temperatures near the glass transition temperature, T g. We discuss this in terms of a superArrhenius factor Δ( T g)=[ E( T g)− E ∞]/ T g, where E ∞ is the activation free energy at high T. We relate Δ( T g ) to the property called “fragility”, and discuss its relation to non-exponential relaxation and to activated dynamics. We postulate that supercooled liquids are broken into supermolecular domains, frustrated phase-related entities which are to be distinguished from species-specific local clusters.
ISSN:0022-3093
1873-4812
DOI:10.1016/S0022-3093(98)00631-0