Structure and Stability of Charge-Coupled Lanthanide-Substituted Ca₁₀(PO₄)₆F₂ as a Potential Fluoride Bearing Nuclear Waste Form.

ABSTRACT: The structure and stability of charge-coupled lanthanide-substituted Ca₁₀(PO₄)₆F₂ as a potential fluoride-bearing nuclear waste form for the back-end fuel cycle of Gen-IV molten salt reactor have been studied in detail. Here, calcium fluorapatite (CaFAp) as a model structure was taken for incorporation of trivalent lanthanides (Lns, La-Lu except Pm) in a charge-coupled fashion, i.e., 2Ca²⁺ = Na⁺ + Ln³⁺. In these fluorapatite phases, Na⁺ is substituted exclusively at nine coordinated sites, Ca1, while Ln³⁺ is preferentially substituted at seven coordinated sites, Ca2. These compositions are further characterized for the local structure by Fourier transform infrared (FTIR) and Raman spectroscop

SUBMITTER: Das P 

PROVIDER: S-EPMC11339994 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature