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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/50905981
Record Status
Checked
Record Id
50905981
Title
Synthesis, Characterization, and Crystal Structure of Dominant Uranium(V) Brannerites in the UTi2–xAlxO6 System
Contributors
MC Dixon Wilkins
,
LM Mottram
,
ER Maddrell
,
MC Stennett
,
CL Corkhill
,
KO Kvashnina
,
NC Hyatt
Abstract
The synthesis, characterization, and crystal structure of a novel (dominant) uranium(V) brannerite of composition U1.09(6)Ti1.29(3)Al0.71(3)O6 is reported, as determined from Rietveld analysis of the high-resolution neutron powder diffraction data. Examination of the UTi2–xAlxO6 system demonstrated the formation of brannerite-structured compounds with varying Al3+ and U5+ contents, from U0.93(6)Ti1.64(3)Al0.36(3)O6 to U0.89(6)Ti1.00(3)Al1.00(3)O6. Substitution of Al3+ for Ti4+, with U5+ charge compensation, resulted in near-linear changes in the b and c unit cell parameters and the overall unit cell volume, as expected from ionic radii considerations. The presence of U5+ as the dominant oxidation state in near-single-phase brannerite compositions was evidenced by complementary laboratory U L3-edge and high-energy-resolution fluorescence-detected U M4-edge X-ray absorption near-edge spectroscopy. No brannerite phase was found for compositions with Al3+/Ti4+ > 1, which would require a U6+ contribution for charge compensation. These data expand the crystal chemistry of uranium brannerites to the stabilization of dominant uranium(V) brannerites by the substitution of trivalent cations, such as Al3+, on the Ti4+ site.
Organisation
ISIS
,
ISIS-HRPD
,
STFC
Keywords
Funding Information
EPSRC
(EP/N017374/1);
EPSRC
(EP/S01019X/1);
EPSRC
(EP/T011424/1);
ERC
, H2020 (759696)
Related Research Object(s):
10.5286/ISIS.E.RB2000257
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Inorg Chem
60, no. 23 (2021): 18112-18121.
doi:10.1021/acs.inorgchem.1c02733
2021
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