Relationship between viscous dynamics and the configurational thermal expansion coefficient of glass-forming liquids

Raphael M.C.V. Reis, John Mauro, Karen L. Geisinger, Marcel Potuzak, Morten M. Smedskjaer, Xiaoju Guo, Douglas C. Allan

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

We propose a model to describe the relationship between the viscosity of a glass-forming liquid and its configurational contribution to liquid state thermal expansion. The viscosity of the glass-forming liquids is expressed in terms of three standard parameters: the glass transition temperature (T g), the liquid fragility index (m), and the extrapolated infinite temperature viscosity (η ), which are obtained by fitting of the Mauro-Yue-Ellison-Gupta-Allan (MYEGA) expression to measured viscosity data. The model is tested with experimental data for 41 different glass-forming systems. A good correlation is observed between our model viscosity parameter,h(T g, m, η ), and the configurational coefficient of thermal expansion (i.e., the configurational CTE). Within a given class of glass compositions, the model offers the ability to predict trends in configurational CTE with changes in viscosity parameters. Since viscosity is governed by glass network topology, the model also suggests the role of topological constraints in governing changes in configurational CTE.

Original languageEnglish (US)
Pages (from-to)648-651
Number of pages4
JournalJournal of Non-Crystalline Solids
Volume358
Issue number3
DOIs
StatePublished - Feb 1 2012

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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