The Local Uranium Environment in Cesium Uranates: A Combined XPS, XAS, XRD, and Neutron Diffraction Analysis

Oxidation and crystal field effects in uranium

“…In this case, the role of the ligand field splitting for the broadening of the L 3 edge (2p 3/2 ) XAS peak was shown to dominate over the unresolved multiplet splittings. Interestingly, the UO 3 L 3 XANES spectrum is significantly different than that of the UO 2 L 3 XANES [9,40]. In fact, there is a shoulder present at about 10 eV above the main white line in γ-UO 3 , possibly corresponding to the 7 eV separation described above for the δ-UO 3 6d…”

U(VI) removal kinetics in presence of synthetic magnetite nanoparticles

“…uranate species are shifted to higher energies compared to uranyl species as shown in (Duff et al, 2002;Van den Berghe et al, 2002;Belai et al, 2008). The po-mag#42 WL broadening, asymmetric shape and its energy position indicate the presence of mixtures of U oxidation states.…”

Uranium fate during crystallization of magnetite from ferrihydrite in conditions relevant to the disposal of radioactive waste

“…3) that was absent in the sorption samples. This has been attributed to U(V) or U(VI) in octahedral uranate coordination (Van den Berghe et al, 2002;Soldatov et al, 2007). Therefore, both the partial shift to lower absorption edge energy, and the shoulder feature in the coprecipitation experiments suggest that U(V) may be present within the samples with uranatelike coordination.…”