Journal Article FZJ-2025-00486

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The role of redox and structure on grain growth in Mn-doped UO2

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2024
Springer Nature London

Communications materials 5(1), 274 () [10.1038/s43246-024-00714-x]

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Abstract: Mn-doped UO2 is considered a potential advanced nuclear fuel due to ameliorated microstructural grain growth compared to non-doped variants. However, recent experimental investigations have highlighted limitations in grain growth apparently arising from misunderstandings of its redox-structural chemistry. To resolve this, we use synchrotron X-ray diffraction and spectroscopy measurements supported by ab initio calculations to cross-examine the redox and structural chemistry of Mn-doped UO2 single crystal grains and ceramic specimens. Measurements reveal Mn enters the UO2 matrix divalently as with the additional formation of fluorite Mn+2O in the bulk material. Extended X-ray absorption near edge structure measurements unveil that during sintering, the isostructural relationship between fluorite UO2 and Mn+2O results in inadvertent interaction and subsequent incorporation of diffusing U species within MnO, rather than neighbouring UO2 grains, inhibiting grain growth. The investigation consequently highlights the significance of considering total redox-structural chemistry of main and minor phases in advanced ceramic material design.

Classification:

Contributing Institute(s):
  1. Nukleare Entsorgung (IFN-2)
Research Program(s):
  1. 1411 - Nuclear Waste Disposal (POF4-141) (POF4-141)
  2. BMBF 02NUK060B - Verbundprojekt AcE: Grundlegende Untersuchungen zur Immobilisierung von Actiniden mittels Einbau in endlagerrelevante Festphasen, Teilprojekt B (02NUK060B) (02NUK060B)

Appears in the scientific report 2024
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Medline ; Creative Commons Attribution CC BY 4.0 ; DOAJ ; OpenAccess ; Article Processing Charges ; Clarivate Analytics Master Journal List ; DOAJ Seal ; Emerging Sources Citation Index ; Fees ; IF >= 5 ; JCR ; SCOPUS ; Web of Science Core Collection
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 Record created 2025-01-13, last modified 2025-02-26


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