Poisson's ratio and liquid's fragility

Spyros N. Yannopoulos () and G. P. Johari
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Spyros N. Yannopoulos: Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes
G. P. Johari: McMaster University

Nature, 2006, vol. 442, issue 7102, E7-E8

Abstract: Abstract Arising from: V. N. Novikov & A. P. Sokolov Nature 431, 961–963 (2004) The lack of a reliable theory of glass physics has led to the pursuit of correlations between various glass or viscous liquid parameters, one of which is the slope m of the plot of log(viscosity) against Tg/T, extrapolated at the glass-transition temperature, Tg, also termed 'fragility'. Novikov and Sokolov1 conclude that the value of m for a liquid varies linearly with the ratio of the instantaneous bulk and shear moduli, K∞/G∞, of its glass according to the relation m=29(K∞/G∞−0.41). Because of the obvious importance of the elastic properties of a glass, we have investigated the basis for this relation1 and find that its premise is flawed because of the unjustifiable preference for an empirical variation of m with elastic properties, and because of the selected use of glasses. When more glasses are considered in the same way, m does not seem to be linearly related to K∞/G∞.

Date: 2006
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DOI: 10.1038/nature04967x

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