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Topologically disordered systems at the glass transition

Ojovan, M.I. and Lee, W.E. (2006) Topologically disordered systems at the glass transition. Journal of Physics: Condensed Matter, 18 (50). pp. 11507-11520. ISSN 1361-648X

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Abstract

The thermodynamic approach to the viscosity and fragility of amorphous oxides was used to determine the topological characteristics of the disordered network-forming systems. Instead of the disordered system of atoms we considered the congruent disordered system of interconnecting bonds. The Gibbs free energy of network-breaking defects (configurons) was found based on available viscosity data. Amorphous silica and germania were used as reference disordered systems for which we found an excellent agreement of calculated and measured glass transition temperatures. We reveal that the Hausdorff dimension of the system of bonds changes from Euclidian three-dimensional below to fractal 2.55 ± 0.05-dimensional geometry above the glass transition temperature.

Item Type: Article
Copyright, Publisher and Additional Information: © 2006 IOP Publishing Ltd. This is an author produced version of a paper subsequently published in Journal of Physics: Condensed Matter.
Keywords: Amorphous materials, liquids, glasses, glass transition, topological disorder, percolation
Academic Units: The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
The University of Sheffield > University of Sheffield Research Centres and Institutes > Immobilisation Science Laboratory (Sheffield)
Depositing User: Repository Officer
Date Deposited: 09 Feb 2007
Last Modified: 08 Feb 2013 16:51
Published Version: http://dx.doi.org/10.1088/0953-8984/18/50/007
Status: Published
Publisher: Institute of Physics
Refereed: Yes
Identification Number: 10.1088/0953-8984/18/50/007
URI: http://eprints.whiterose.ac.uk/id/eprint/1958

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