Fabrication, defect chemistry and microstructure of Mn-doped UO2.

Autor:	Smith, H., Townsend, L. T., Mohun, R., Mosselmans, J. F. W., Kvashnina, K., Hyatt, Neil C., Corkhill, C. L.
Předmět:	X-ray fluorescence X-ray absorption NUCLEAR fuels RAMAN spectroscopy X-ray spectroscopy X-ray detection X-ray absorption near edge structure
Zdroj:	Scientific Reports; 1/18/2024, Vol. 13 Issue 1, p1-12, 12p
Abstrakt:	Mn-doped UO2 is under consideration for use as an accident tolerant nuclear fuel. We detail the synthesis of Mn-doped UO2 prepared via a wet co-precipitation method, which was refined to improve the yield of incorporated Mn. To verify the Mn-doped UO2 defect chemistry, X-ray absorption spectroscopy at the Mn K-edge was performed, in addition to X-ray diffraction, Raman spectroscopy and high-energy resolved fluorescence detection X-ray absorption near edge spectroscopy at the U M4-edge. It was established that Mn2+ directly substitutes for U4+ in the UO2 lattice, accompanied by oxygen vacancy (Ov) charge compensation. In contrast to other divalent-element doped UO2 materials, compelling evidence for U5+ in a charge compensating role was not found. This work furthers understanding of the structure and crystal chemistry of Mn-doped UO2, which could show potential advantages as a novel efficient advanced nuclear fuel. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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