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|Title:||A New Look at the Structural Properties of Trisodium Uranate Na3UO4|
|Authors:||SMITH ANNA; RAISON Philippe; MARTEL LAURA; PRIEUR DAMIEN; CHARPENTIER THIBAULT; WALLEZ G; SUARD E.; SCHEINOST Andreas; HENNIG Christoph; MARTIN P.; KVASHNINA Kristina; CHEETHAM A.k.; KONINGS Rudy|
|Citation:||INORGANIC CHEMISTRY vol. 54 no. 7 p. 3552 - 3561|
|Publisher:||AMER CHEMICAL SOC|
|Type:||Articles in periodicals and books|
|Abstract:||The crystal structure of trisodium uranate, which forms following the interaction between sodium and hyperstoichiometric urania, has been solved for the first time using powder X-ray and neutron diffraction, X-ray absorption near-edge structure spectroscopy, and solid-state 23Na multiquantum magic angle spinning nuclear magnetic resonance. The compound, isostructural with Na3BiO4, has monoclinic symmetry, in space group P2/c. Moreover, it has been shown that this structure can accommodate some cationic disorder, with up to 16(2)% sodium on the uranium site, corresponding to the composition α-Na3(U1–x,Nax)O4 (0 < x < 0.18). The α phase adopts a mixed valence state with the presence of U(V) and U(VI). The two polymorphs of this compound described in the literature, m- and β-Na3(U1–x,Nax)O4, have also been investigated, and their relationship to the α phase has been established. The completely disordered low-temperature cubic phase corresponds to a metastable phase. The semiordered high-temperature β phase is cubic, in space group Fd3̅m.|
|JRC Directorate:||Nuclear Safety and Security|
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