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001037139 1001_ $$0P:(DE-Juel1)176900$$aMurphy, Gabriel L.$$b0$$eCorresponding author
001037139 245__ $$aThe role of redox and structure on grain growth in Mn-doped UO2
001037139 260__ $$aLondon$$bSpringer Nature$$c2024
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001037139 520__ $$aMn-doped UO2 is considered a potential advanced nuclear fuel due to ameliorated microstructural grain growth compared to non-doped variants. However, recent experimental investigations have highlighted limitations in grain growth apparently arising from misunderstandings of its redox-structural chemistry. To resolve this, we use synchrotron X-ray diffraction and spectroscopy measurements supported by ab initio calculations to cross-examine the redox and structural chemistry of Mn-doped UO2 single crystal grains and ceramic specimens. Measurements reveal Mn enters the UO2 matrix divalently as with the additional formation of fluorite Mn+2O in the bulk material. Extended X-ray absorption near edge structure measurements unveil that during sintering, the isostructural relationship between fluorite UO2 and Mn+2O results in inadvertent interaction and subsequent incorporation of diffusing U species within MnO, rather than neighbouring UO2 grains, inhibiting grain growth. The investigation consequently highlights the significance of considering total redox-structural chemistry of main and minor phases in advanced ceramic material design.
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001037139 7001_ $$0P:(DE-HGF)0$$aBazarkina, Elena$$b1
001037139 7001_ $$0P:(DE-HGF)0$$aRossberg, André$$b2
001037139 7001_ $$00000-0002-4343-7638$$aSilva, Clara L.$$b3
001037139 7001_ $$0P:(DE-HGF)0$$aAmidani, Lucia$$b4
001037139 7001_ $$0P:(DE-Juel1)130329$$aBukaemskiy, Andrey$$b5$$ufzj
001037139 7001_ $$0P:(DE-Juel1)187409$$aThümmler, Robert$$b6
001037139 7001_ $$0P:(DE-Juel1)130364$$aKlinkenberg, Martina$$b7$$ufzj
001037139 7001_ $$0P:(DE-Juel1)176390$$aHenkes, Maximilian$$b8$$ufzj
001037139 7001_ $$0P:(DE-HGF)0$$aMarquardt, Julien$$b9
001037139 7001_ $$0P:(DE-HGF)0$$aLessing, Jessica$$b10
001037139 7001_ $$0P:(DE-HGF)0$$aSvitlyk, Volodymyr$$b11
001037139 7001_ $$0P:(DE-HGF)0$$aHennig, Christoph$$b12
001037139 7001_ $$00000-0003-4447-4542$$aKvashnina, Kristina O.$$b13
001037139 7001_ $$00000-0002-9930-2329$$aHuittinen, Nina$$b14
001037139 773__ $$0PERI:(DE-600)3008524-X$$a10.1038/s43246-024-00714-x$$gVol. 5, no. 1, p. 274$$n1$$p274$$tCommunications materials$$v5$$x2662-4443$$y2024
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