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Structural dependence of crystallization in glasses along the nepheline (NaAlSiO 4 ) ‐ eucryptite (LiAlSiO 4 ) join
Author(s) -
Marcial José,
Kabel Joey,
Saleh Muad,
Washton Nancy,
Shaharyar Yaqoot,
Goel Ashutosh,
McCloy John S.
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15439
Subject(s) - nepheline , crystallization , raman spectroscopy , aluminosilicate , alkali metal , materials science , nmr spectra database , lithium (medication) , glass transition , mineralogy , sodium aluminosilicate , devitrification , crystallography , analytical chemistry (journal) , chemistry , spectral line , medicine , biochemistry , physics , organic chemistry , chromatography , astronomy , optics , endocrinology , catalysis , polymer , composite material
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 LiAlSiO 4 (eucryptite) in high‐Li 2 O compositions, analogous to the more well‐known problem of NaAlSiO 4 (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 Li x Na 1‐ x AlSiO 4 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 LiAlSiO 4 and NaAlSiO 4 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 Li x Na 1‐ x AlSiO 4 crystalline phases, suggesting that these measurements can reveal subtle chemical environment differences in mixed‐alkali systems, similar to what has been observed for zeolites.