Topological hardening through oxygen triclusters in calcium aluminosilicate glasses

Rebecca S. Welch, Kuo Hao Lee, Collin J. Wilkinson, Madoka Ono, Caio B. Bragatto, John C. Mauro

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Molecular dynamics simulations and topological constraint theory are used to study the impact of oxygen triclusters in the calcium aluminosilicate glass system at ratios of 0.6, 1, 1.5, 2, and 4 [Al2O3]/[CaO]. Negligible percentages (less than ~3%) of five-coordinated Al structures are found at all ratios. Up to ~27% three-coordinated oxygens, also known as triclusters, are found at the highest ratio of [Al2O3]/[CaO]. A topological constraint model, which considers additional constraints provided by triclusters, is created to predict the glass transition temperature, hardness, and Young's modulus. The models are used to elucidate the role of triclusters in glass properties. Analysis of topological constraints shows that triclusters can potentially increase the glass hardness within the calcium aluminosilicate system. The results are also compared to oxynitride glasses. Triclusters show the same ability as nitrogen to increase the glass hardness but are less effective at increasing the Young's modulus.

Original languageEnglish (US)
Pages (from-to)6183-6193
Number of pages11
JournalJournal of the American Ceramic Society
Issue number12
StatePublished - Dec 2021

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry


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