A simple nonlinear equation for structural relaxation in glasses

Itamar Kolvin; Eran Bouchbinder

doi:10.1103/physreve.86.010501

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arXiv · 1205.3894

A simple nonlinear equation for structural relaxation in glasses

Itamar Kolvin·Eran Bouchbinder

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Abstract

A wide range of glassy and disordered materials exhibit complex, non-exponential, structural relaxation (aging). We propose a simple nonlinear rate equation dδ/dt = a [1-exp (bδ)], where 'δ' is the normalized deviation of a macroscopic variable from its equilibrium value, to describe glassy relaxation. Analysis of extensive experimental data shows that this equation quantitatively captures structural relaxation, where 'a' and 'b' are both temperature-, and more importantly, history-dependent parameters. This analysis explicitly demonstrates that structural relaxation cannot be accurately described by a single non-equilibrium variable. Relaxation rates extracted from the data imply the existence of cooperative rearrangements on a super-molecular scale.

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Itamar Kolvin, Eran Bouchbinder. 2012-05-17. A simple nonlinear equation for structural relaxation in glasses. https://doi.org/10.1103/physreve.86.010501

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