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Flux crystal growth of Ba 2 [(UO 2 ) 2 Ti 2 O 8 ]: Structures, spectroscopies and implications
Author(s) -
Lu Kimbal T.,
Zhang Yingjie,
Wei Tao,
Karatchevtseva Inna,
Zhang Zhaoming,
Zheng Rongkun
Publication year - 2023
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.18792
Subject(s) - uranyl , raman spectroscopy , uranium , crystallography , crystal structure , materials science , extended x ray absorption fine structure , x ray crystallography , valence (chemistry) , transmission electron microscopy , crystal (programming language) , xanes , absorption spectroscopy , analytical chemistry (journal) , spectroscopy , diffraction , chemistry , nanotechnology , optics , chromatography , quantum mechanics , computer science , metallurgy , programming language , physics , organic chemistry
We report a flux crystal growth of Ba 2 [(UO 2 ) 2 Ti 2 O 8 ] and subsequent structural and spectroscopic studies using multiple techniques. The layered crystal structure, built up with sheets of edge‐sharing dimeric uranyl pentagonal bipyramids and dimeric TiO 5 square pyramids with interlayer Ba(II) ions, was revealed by synchrotron single crystal x‐ray diffraction and confirmed with electron diffraction using a transmission electron microscope. The presence of only hexavalent uranium was confirmed by both diffuse reflectance and x‐ray absorption near‐edge structure spectroscopies, consistent with the bond valence sum calculations. Its vibrational modes were revealed by Raman spectroscopy. In addition, its implications as a potential hexavalent uranium waste form for the immobilization of uranium‐rich radioactive wastes were discussed.