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@ARTICLE{Murphy:1037139,
      author       = {Murphy, Gabriel L. and Bazarkina, Elena and Rossberg,
                      André and Silva, Clara L. and Amidani, Lucia and
                      Bukaemskiy, Andrey and Thümmler, Robert and Klinkenberg,
                      Martina and Henkes, Maximilian and Marquardt, Julien and
                      Lessing, Jessica and Svitlyk, Volodymyr and Hennig,
                      Christoph and Kvashnina, Kristina O. and Huittinen, Nina},
      title        = {{T}he role of redox and structure on grain growth in
                      {M}n-doped {UO}2},
      journal      = {Communications materials},
      volume       = {5},
      number       = {1},
      issn         = {2662-4443},
      address      = {London},
      publisher    = {Springer Nature},
      reportid     = {FZJ-2025-00486},
      pages        = {274},
      year         = {2024},
      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.},
      cin          = {IFN-2},
      ddc          = {600},
      cid          = {I:(DE-Juel1)IFN-2-20101013},
      pnm          = {1411 - Nuclear Waste Disposal (POF4-141) / BMBF 02NUK060B -
                      Verbundprojekt AcE: Grundlegende Untersuchungen zur
                      Immobilisierung von Actiniden mittels Einbau in
                      endlagerrelevante Festphasen, Teilprojekt B (02NUK060B)},
      pid          = {G:(DE-HGF)POF4-1411 / G:(BMBF)02NUK060B},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001381203000005},
      doi          = {10.1038/s43246-024-00714-x},
      url          = {https://juser.fz-juelich.de/record/1037139},
}