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Poisson's ratio and liquid's fragility

Author

Listed:
  • Spyros N. Yannopoulos

    (Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes)

  • G. P. Johari

    (McMaster University)

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∞.

Suggested Citation

  • Spyros N. Yannopoulos & G. P. Johari, 2006. "Poisson's ratio and liquid's fragility," Nature, Nature, vol. 442(7102), pages 7-8, August.
    • Handle: RePEc:nat:nature:v:442:y:2006:i:7102:d:10.1038_nature04967x
    DOI: 10.1038/nature04967x
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