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A chemical approach to understand fragilities of glass-forming liquids

Rao, KJ and Kumar, Sundeep and Bhat, MH (2001) A chemical approach to understand fragilities of glass-forming liquids. In: Journal of Physical Chemistry B, 105 (38). pp. 9023-9027.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jp011802z


Fragility is viewed as a measure of the loss of rigidity of a glass structure above its glass transition temperature. It is attributed to the weakness of directional bonding and to the presence of a high density of low-energy configurational states. An a priori fragility function of electronegativities and bond distances is proposed which quite remarkably reproduces the entire range of reported fragilities and demonstrates that the fragility of a melt is indeed encrypted in the chemistry of the parent material. It has also been shown that the use of fragility-modified activation barriers in the Arrhenius function account for the whole gamut of viscosity behavior of liquids. It is shown that fragility can be a universal scaling parameter to collapse all viscosity curves on to a master plot.

Item Type: Editorials/Short Communications
Publication: Journal of Physical Chemistry B
Publisher: American Chemical Society
Additional Information: Copyright of this article belongs to American Chemical Society.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 02 Aug 2011 09:44
Last Modified: 02 Aug 2011 09:44
URI: http://eprints.iisc.ac.in/id/eprint/39320

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