Structure of Sodium Aluminosilicate Glasses

David M. Zirl, Stephen H. Garofalini

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

A series of sodium aluminosilicate glasses composed of varying ratios (R) of Al2O3/Na2O (0.25 R 2.0) has been simulated with the molecular dynamics technique using a tetrahedral form of a three‐body interaction potential. Extrema in the activation energies for sodium diffusion and in the diffusion constants for all of the atomic species were observed for glasses with equal concentrations of Al2O3 and Na2O (R= 1.0). These changes corresponded to the minimum observed experimentally in the activation energy for electrical conductivity and to the maximum observed in the viscosity for glasses with compositions of R= 1.0. The coordination of aluminum remained 4 over the entire compositional range, negating the need to invoke a coordination change of aluminum to explain the changes in the physical properties. The changes to the simulated physical properties as R passed through the equivalence point were attributed to the elimination of nonbridging oxygen, to the introduction of oxygen triclusters, and to changes in the distribution of ring structures within the glass networks.

Original languageEnglish
Pages (from-to)2848-2856
Number of pages9
JournalJournal of the American Ceramic Society
Volume73
Issue number10
DOIs
Publication statusPublished - Oct 1990

Keywords

  • aluminosilicates
  • glass
  • molecular dynamics
  • sodium
  • structure

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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