Structural dependence of crystallization in glasses along the nepheline (NaAlSiO4) - eucryptite (LiAlSiO4) join

José Marcial, Joey Kabel, Muad Saleh, Nancy Washton, Yaqoot Shaharyar, Ashutosh Goel, John S. McCloy

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Lithium and sodium aluminosilicates are important glass-forming systems for commercial glass-ceramics, as well as being important model systems for ion transport in battery studies. In addition, uncontrolled crystallization of LiAlSiO4 (eucryptite) in high-Li2O compositions, analogous to the more well-known problem of NaAlSiO4 (nepheline) crystallization, can cause concerns for long-term chemical durability in nuclear waste glasses. To study the relationships between glass structure and crystallization, nine glasses were synthesized in the LixNa1- xAlSiO4 series, from x = 0 to x = 1. Raman spectra, nuclear magnetic resonance (NMR) spectroscopy (Li-7, Na-23, Al-27, Si-29), and X-ray diffraction were used to study the quenched and heat-treated glasses. It was found that different LiAlSiO4 and NaAlSiO4 crystal phases crystallize from the glass depending on the Li/Na ratio. Raman and NMR spectra of quenched glasses suggest similar structures regardless of alkali substitution. Li-7 and Na-23 NMR spectra of the glass-ceramics near the endmember compositions show evidence of several differentiable sites distinct from known LixNa1- xAlSiO4 crystalline phases, suggesting that these measurements can reveal subtle chemical environment differences in mixed-alkali systems, similar to what has been observed for zeolites.

Original languageEnglish (US)
Pages (from-to)2840-2855
Number of pages16
JournalJournal of the American Ceramic Society
Volume101
Issue number7
DOIs
StatePublished - Jul 2018

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Keywords

  • aluminosilicates
  • crystals/crystallization
  • glass
  • lithium oxide
  • nuclear waste

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