Title: A New Look at the Structural Properties of Trisodium Uranate Na3UO4
Authors: SMITH ANNARAISON PhilippeMARTEL LAURAPRIEUR DAMIENCHARPENTIER THIBAULTWALLEZ GSUARD E.SCHEINOST AndreasHENNIG ChristophMARTIN P.KVASHNINA KristinaCHEETHAM A.k.KONINGS Rudy
Citation: INORGANIC CHEMISTRY vol. 54 no. 7 p. 3552 - 3561
Publisher: AMER CHEMICAL SOC
Publication Year: 2015
JRC N°: JRC90135
ISSN: 0020-1669
URI: http://pubs.acs.org/doi/abs/10.1021/acs.inorgchem.5b00136
http://publications.jrc.ec.europa.eu/repository/handle/JRC90135
DOI: 10.1021/acs.inorgchem.5b00136
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

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.