Correlation of fragility with mechanical moduli in double-well potential for glass-forming liquid

Wan Qiang Cao

Physica A: Statistical Mechanics and its Applications, 2012, vol. 391, issue 4, 1105-1110

Abstract: The shoving model and the Vogel–Fulcher relation are employed to derive correlation of the fragility with the mechanical moduli for glass-forming simple liquids. The result shows that a liquid with smaller fragility will have larger ratio of K∞/G∞ in dilute liquid system. Based on radial distribution function with the Lennard-Jones potential modified by the Gaussian potential with a second minimum, fragility of the supercooled simple liquid is derived from the correlation between viscosity and shear modulus via configurational entropy. The results demonstrate that the fragility is determined by two parts: thermodynamic components and mechanical moduli. For a weak Gaussian potential liquid, the fragility is proportional to the Tg, while for a strong one, the fragility is inversely proportional to the Tg, and the Gaussian potential will increase fragility.

Keywords: Glass-forming liquid; Radial distribution function; Fragility; Mechanical moduli (search for similar items in EconPapers)
Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:391:y:2012:i:4:p:1105-1110

DOI: 10.1016/j.physa.2011.11.003

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