We propose a scenario for the glass transition based on the cooperative nature of nucleation processes and entropic effeets. The main point is the relation between the off-equilibrium energy dissipation and nucleation processes in off-equilibrium supercooled liquids which leads to a natural definition of the complexity. From the absence of coarsening growth we can derive an entropy-based fluctuation formula which relates the free-energy dissipation rate in the glass to the nucleation rate of the largest cooperative regions. As a by-product we obtain a new phenomenological relation between the longest relaxation time in the supercooled liquid phase and an effective temperature. This differs from the Adam-Gibbs relation in that it predicts no divergence of the primary relaxation time at the Kauzmann temperature and the existence of a crossover from fragile to strong behaviour.

A glass transition scenario based on heterogeneities and entropy barriers / Crisanti, Andrea; F., Ritort. - In: PHILOSOPHICAL MAGAZINE. B. - ISSN 1463-6417. - STAMPA. - 82:(2002), pp. 143-149. [10.1080/13642810110084920]

A glass transition scenario based on heterogeneities and entropy barriers

CRISANTI, Andrea;
2002

Abstract

We propose a scenario for the glass transition based on the cooperative nature of nucleation processes and entropic effeets. The main point is the relation between the off-equilibrium energy dissipation and nucleation processes in off-equilibrium supercooled liquids which leads to a natural definition of the complexity. From the absence of coarsening growth we can derive an entropy-based fluctuation formula which relates the free-energy dissipation rate in the glass to the nucleation rate of the largest cooperative regions. As a by-product we obtain a new phenomenological relation between the longest relaxation time in the supercooled liquid phase and an effective temperature. This differs from the Adam-Gibbs relation in that it predicts no divergence of the primary relaxation time at the Kauzmann temperature and the existence of a crossover from fragile to strong behaviour.
2002
01 Pubblicazione su rivista::01a Articolo in rivista
A glass transition scenario based on heterogeneities and entropy barriers / Crisanti, Andrea; F., Ritort. - In: PHILOSOPHICAL MAGAZINE. B. - ISSN 1463-6417. - STAMPA. - 82:(2002), pp. 143-149. [10.1080/13642810110084920]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/68916
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