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∞.
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06 July 2018
This article was initially published with an incorrect DOI. A new DOI has been assigned and registered at Crossref, and has been corrected in the article.
22 November 2006
An Erratum to this paper has been published: https://doi.org/10.1038/nature05460
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Yannopoulos, S., Johari, G. Poisson's ratio and liquid's fragility. Nature 442, E7–E8 (2006). https://doi.org/10.1038/nature04967x
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