Investigation of Americium-Containing Phosphates, Silicates, Borates, Molybdates, and Fluorides Synthesized via High-Temperature Flux Crystal Growth

Document Type

Article

Abstract

The crystal chemistry of americium-containing extended structures was investigated, and several classes of americium-containing solid-state oxide materials were obtained in single-crystal form via high-temperature flux crystal growth. This enabled the structural characterization of rare examples of ternary, quaternary, and penternary americium-containing silicates K3Am (Si2O7) and Cs6Am2Si21O48, phosphates Na3Am (PO4)2 and K3Am (PO4)2, borates Ba3Am2(BO3)4 and AmBO3, borate halides Ca5Am(BO3)4Cl, molybdates Li0.5Am0.5MoO4, and fluorides CsAm2F7. Using these crystallographic data, the ionic radii of Am3+ with coordination numbers of six (0.975 Å), seven (1.052 Å), and nine (1.162 Å) were established. A maximum entropy method (MEM) analysis was performed on the single-crystal X-ray diffraction data that were collected for K3Nd(PO4)2/K3Am(PO4)2, K3NdSi2O7/K3AmSi2O7, and NdBO3/AmBO3, to qualitatively compare the ionicities of the Nd-O and Am-O bonds. Raman spectroscopy data were collected on single crystals of K3Am(PO4)2 and compared to the calculated Raman spectrum of K3Am(PO4)2 obtained from DFT calculations.

Digital Object Identifier (DOI)

https://doi.org/10.1021/jacs.5c03457

Rights

© 2025 American Chemical Society

APA Citation

Tisdale, Hines, Smith, & Besmann (2025). Investigation of Americium-Containing Phosphates, Silicates, Borates, Molybdates, and Fluorides Synthesized Via High-Temperature Flux Crystal Growth. Journal of the American Chemical Society, 147(25), 21659–21671. https://doi.org/10.1021/jacs.5c03457

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