Refinement of the alpha-U$_4$O$_9$ crystalline structure: New insight into the U$_4$O$_9$-> U$_3$O$_8$ transformation - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Inorganic Chemistry Année : 2011

Refinement of the alpha-U$_4$O$_9$ crystalline structure: New insight into the U$_4$O$_9$-> U$_3$O$_8$ transformation

Résumé

The oxidation reaction of UO$_2$ into U$_3$O$_8$ is studied as a function of the crystalline distortion of interstitial oxygen clusters, named cuboctahedra, which appear in U$_4$O$_9$ and U$_3$O$_7$ intermediate phases. For that purpose, the refinement of α-U$_4$O$_9$ was performed because this phase undergoes a trigonal distortion from cubic β-U$_4$O$_9$ when the temperature is decreased. In α-U$_4$O$_9$, the cuboctahedra can be described as crumpled sheets taken from a fragment of U$_3$O$_8$ The manner by which the accumulation of crumpled sheets can lead to the formation of U$_3$O$_8$ is discussed.
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Dates et versions

hal-00639190 , version 1 (23-05-2023)

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Citer

Lionel Desgranges, Gianguido Baldinozzi, David Simeone, H. E. Fischer. Refinement of the alpha-U$_4$O$_9$ crystalline structure: New insight into the U$_4$O$_9$-> U$_3$O$_8$ transformation. Inorganic Chemistry, 2011, 50, pp.6146-6151. ⟨10.1021/ic200316b⟩. ⟨hal-00639190⟩
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