Insights into the structure of alkali borate glasses

D. P. Button, R. Tandon, C. King, M. H. Veléz, H. L. Tuller, D. R. Uhlmann

Research output: Contribution to journalArticle

96 Scopus citations

Abstract

In the light of extensive new glass transition temperature (Tg) and density (ρ{variant}) data obtained for the ternary glass system Li2O(LiCl)2B2O3 we have re-examined the well accepted structural models developed for borate glasses by Krogh-Moe and co-workers. We find that, in contrast to the conclusions of NMR, Raman and IR spectroscopy, glasses in the binary and in the ternary systems with common O/B ratios do not exhibit identical boron-oxygen networks. Rather, we find that as LiCl in the ternary is increased the network is systematically weakened and expanded to accommodate the large Cl- anion. On the basis of these observations we question the ability of spectroscopic techniques such as Raman and NMR to confirm the uniqueness of structural models based on combinations of intermediate-range units. We propose a tentative model which is qualitatively in agreement with the observed changes in Tg and ρ{variant} upon addition of LiCl, and explains how the large Cl- ions can be accommodated without large increases in energy due to strain and electrostatic effects while maintaining BO4/BO3 constant. Recent transport results on some fast ion conducting glasses in this system are also discussed in terms of the proposed model.

Original languageEnglish (US)
Pages (from-to)129-142
Number of pages14
JournalJournal of Non-Crystalline Solids
Volume49
Issue number1-3
DOIs
StatePublished - May 1982
Externally publishedYes

ASJC Scopus subject areas

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

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