Assessment of the local structure of U3O7 using neutron total scattering.
The behavior of nuclear fuel under oxidation and alpha self-irradiation is a key topic for the safety assessment of nuclear (interim) storage facilities. U4O9, U3O7, and U3O8 compounds are part of the series of oxides that form under oxidation. At present, some of these structures are well known, but some discrepancies still exist between the results obtained by diffraction techniques highly sensitive to the long-range order of these structures and methods which probe more the local environment. The structure of U3O7 is defined by the occurence of oxygen cuboctahedra, but the stacking motif determined from neutron diffraction and selected-area electron diffraction experiments is different. One of the possible explanations for the discrepancy is that the former model represents the average of correlated microdomains of nanometric size. Hence, in addition to standard Rietveld refinement of neutron scattering data, PDF (pair distribution functions) analysis should be carried out to gather structural information about the local structure of U3O7.
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LEINDERS Gregory; BALDINOZZI Gianguido; CUELLO Gabriel; Henry E. Fischer; LAMOEN Dirk and VERWERFT Marc. (2021). Assessment of the local structure of U3O7 using neutron total scattering.. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-06-500
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