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arXiv · 2203.11428

The Angell Plot from the Potential Energy Landscape Perspective

D. M. Zhang·D. Y. Sun·X. G. Gong
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Abstract

Within the scenario of the potential energy landscape (PEL), a thermodynamic model has been developed to uncover the physics behind the Angell plot. In our model, by separating the barrier distribution in PELs into a Gaussian-like and a power-law form, we obtain a general relationship between the relaxation time and the temperature. The wide range of the experimental data in the Angell plot, as well as the molecular-dynamics data, can be excellently fitted by two characteristic parameters, the effective barrier ({\omega}) and the effective width ({\sigma}) of a Gaussian-like distribution. More importantly, the fitted {\omega} and {\sigma}^2 for all glasses are found to have a simple linear relationship within a very narrow band, and fragile and strong glasses are well separated in the {\omega}-{\sigma}^2 plot, which indicates that glassy states only appear in a specific region of the PEL.

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BibTeXRIS

D. M. Zhang, D. Y. Sun, X. G. Gong. 2022-03-22. The Angell Plot from the Potential Energy Landscape Perspective. https://doi.org/10.1103/physreve.106.064129

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