We discuss the relaxation in glasses in terms of local relaxation events (LRE) which glass uses to adjust to external perturbations. The dynamics of LRE is governed by a differential equation with a solution that fits well to the stretched-exponential relaxation. We discuss how this picture gives rise to the observed correlations of nonexponentiality with temperature, relaxation time, and structure of glass or fragility of a glass-forming system.
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Trachenko et al. (2004) studied this question.
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