Fragility percentage evaluation for glass forming melts

The dependence of the viscosity on temperature for glass forming melts separates them into two categories: fragile and strong. We propose an intuitive method for quantitative evaluation of the glass forming melts fragility by a structural parameter - fragility percentage pF which allows the comparis...

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Bibliographic Details
Published in:Journal of Optoelectronics and Advanced Materials 2007-12, Vol.9 (12), p.3765-3768
Main Authors: Radu, D, Nicolescu, M S, Protopopescu, N
Format: Article
Language:English
Online Access:Get full text
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Summary:The dependence of the viscosity on temperature for glass forming melts separates them into two categories: fragile and strong. We propose an intuitive method for quantitative evaluation of the glass forming melts fragility by a structural parameter - fragility percentage pF which allows the comparison of the glass melts without considering their particular chemical composition. A strong correlation between fragility percentage and the main number of non-bridged oxygen (Onb) was established. The study is also related to a numerical application of the proposed indicator made for glass with different chemical compositions compared with the base oxide system Na2O-SiO2. The greater the basicity of the glasses the more fragile character of the glass forming melts is observed.
ISSN:1454-4164