Cuboctahedral oxygen clusters in U3O7

F. Garrido; R. M. Ibberson; L. Nowicki; B. T.M. Willis

doi:10.1016/S0022-3115(03)00318-0

Cuboctahedral oxygen clusters in U₃O₇

F. Garrido, R. M. Ibberson, L. Nowicki, B. T.M. Willis

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Abstract

When UO₂ is oxidised to U₃O₇, the positions in the crystal lattice of all the uranium atoms and of about 70% of the oxygen atoms are hardly affected. The remaining oxygen atoms occupy new sites which are located 310 pm along 〈110〉 vectors from the holes in the fluorite framework of UO₂. These results, which are based on the analysis of neutron diffraction powder data, are consistent with the concept that excess oxygen in U₃O₇ is accommodated in cuboctahedral anionic clusters.

Original language	English
Pages (from-to)	87-89
Number of pages	3
Journal	Journal of Nuclear Materials
Volume	322
Issue number	1
DOIs	https://doi.org/10.1016/S0022-3115(03)00318-0
State	Published - Oct 1 2003
Externally published	Yes

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abstract = "When UO2 is oxidised to U3O7, the positions in the crystal lattice of all the uranium atoms and of about 70% of the oxygen atoms are hardly affected. The remaining oxygen atoms occupy new sites which are located 310 pm along 〈110〉 vectors from the holes in the fluorite framework of UO2. These results, which are based on the analysis of neutron diffraction powder data, are consistent with the concept that excess oxygen in U3O7 is accommodated in cuboctahedral anionic clusters.",

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AU - Ibberson, R. M.

AU - Nowicki, L.

AU - Willis, B. T.M.

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N2 - When UO2 is oxidised to U3O7, the positions in the crystal lattice of all the uranium atoms and of about 70% of the oxygen atoms are hardly affected. The remaining oxygen atoms occupy new sites which are located 310 pm along 〈110〉 vectors from the holes in the fluorite framework of UO2. These results, which are based on the analysis of neutron diffraction powder data, are consistent with the concept that excess oxygen in U3O7 is accommodated in cuboctahedral anionic clusters.

AB - When UO2 is oxidised to U3O7, the positions in the crystal lattice of all the uranium atoms and of about 70% of the oxygen atoms are hardly affected. The remaining oxygen atoms occupy new sites which are located 310 pm along 〈110〉 vectors from the holes in the fluorite framework of UO2. These results, which are based on the analysis of neutron diffraction powder data, are consistent with the concept that excess oxygen in U3O7 is accommodated in cuboctahedral anionic clusters.

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Cuboctahedral oxygen clusters in U₃O₇

Abstract

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