Investigation of uranium oxide hydrates with barium(ıı) ions: structural diversity, uranium valences and implications

0574228 - FZÚ 2024 RIV GB eng J - Journal Article
Lu, K.T. - Zhang, Y. - Wei, T. - Ablott, T.A. - Plášil, Jakub - Karatchevtseva, I. - Zheng, R.
Investigation of uranium oxide hydrates with barium(ıı) ions: structural diversity, uranium valences and implications.
New Journal of Chemistry. Roč. 47, č. 28 (2023), s. 13286-13296. ISSN 1144-0546. E-ISSN 1369-9261
Institutional support: RVO:68378271
Keywords : Barium(II) ions * Uranium oxides * natural weathering * x-ray diffraction * crystal structure
OECD category: Mineralogy
Impact factor: 3.3, year: 2022
Method of publishing: Open access

Although barium(II) ions play an important role in the natural weathering of the mineral uraninite (UO2+x) and are expected to therefore do the same for spent nuclear fuel in geological disposal, the detailed structural understanding of this role is rather limited. In this work, we report the synthesis and characterisation of two new uranium oxide hydrate (UOH) phases with barium(II) ions, a layer-structured UOH-Ba1 constructed with undulating uranyl oxide hydroxide layers incorporating hydrated interlayer barium(II) ions, and UOH-Ba2 forming a complex three-dimensional structure by linking six different types of uranium polyhedrons with barium(II) ions located in the narrow channels. Both crystal structures were revealed using synchrotron single crystal X-ray diffraction and confirmed with powder X-ray or electron diffractions.

Permanent Link: https://hdl.handle.net/11104/0344570