Radioactive Waste Management in U/Th Fuel Cycles

Raj, Kanwar; Kaushik, C.P.; Mishra, R.

doi:10.1007/978-1-4471-5589-8_8

Cited by 3 publications

(2 citation statements)

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“…26 Silicate and phosphate glasses are the main matrices for immobilization of many nuclear wastes, 27,28 some of which include fluoride. 29,30 Recently, there has been increased interest in high-fluorine-containing glasses and glass ceramics, to accommodate radioactive wastes from fluoride-based molten salt reactors. 31−33 In the current study, fluorine incorporation in a sodium and calcium alumino-boro-silicate system was investigated to assess the limits of fluorine retention.…”

Section: Introductionmentioning

confidence: 99%

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Fluorine in Complex Alumino-Boro-Silicate Glasses: Insight into Chemical Environment and Structure

McCloy,

Smith-Gray,

Bussey

et al. 2024

Inorg. Chem.

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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), 27 Al and 19 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 2 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 [4] Al−F−Ca/Na local structures. We propose a general understanding of the expected chemical shift of 19 F NMR in systems containing Al, Ca, and Na.

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Section: Introductionmentioning

confidence: 99%

“…Silicate and phosphate glasses are the main matrices for immobilization of many nuclear wastes, , some of which include fluoride. , Recently, there has been increased interest in high-fluorine-containing glasses and glass ceramics, to accommodate radioactive wastes from fluoride-based molten salt reactors. − …”

Section: Introductionmentioning

confidence: 99%