AI Article Synopsis
- Fluorine incorporation in silicate glasses is significant for various applications like geophysics and waste management.
- This study investigated how fluorine influences the structure of alkaline alumino-borosilicate glass with up to 25 mol % fluorine.
- Techniques used included XRD and NMR spectroscopy, revealing that most fluorine remains in the glass, but excess forms crystalline phases at higher concentrations, illustrating complex interactions within the glass structure.
Article Abstract
Fluorine incorporation into silicate glasses is important for technical fields as diverse as geophysics, extractive metallurgy, reconstructive dentistry, optical devices, and radioactive waste management. In this study, we explored the structural role of fluorine in alkaline alumino-borosilicate glass, with increasing amounts of fluorine up to 25 mol % F while maintaining the glass composition. Glasses were characterized by X-ray diffraction (XRD), Al and F magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, and electron probe microanalysis. Results showed that essentially all F was retained; however, between 12 and 15 mol % F (∼3.6 and 4.5 wt % F), excess fluorine partitions to CaF and then NaF and Na-Al-F crystalline phases. Even prior to crystallization, there exist five distinct F sites, three of which evolve into crystalline phases. The two persistent glassy sites likely involve Al-F-Ca/Na local structures. We propose a general understanding of the expected chemical shift of F NMR in systems containing Al, Ca, and Na.
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| http://dx.doi.org/10.1021/acs.inorgchem.3c04281 | DOI Listing |
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