Further insights into the chemistry of the Bi-U-O system

Cubic fluorite-type phases have been reported in the U IV O 2 -Bi 2 O 3 system for the entire compositional range, but an unusual non-linear variation of the lattice parameter with uranium substitution has been observed. In the current extensive investigation of the uranium( iv ) oxide-bismuth( iii...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2016-05, Vol.45 (18), p.7847-7855
Main Authors: Popa, Karin, Prieur, Damien, Manara, Dario, Naji, Mohamed, Vigier, Jean-François, Martin, Philippe M, Dieste Blanco, Oliver, Scheinost, Andreas C, Prüβmann, Tim, Vitova, Tonya, Raison, Philippe E, Somers, Joseph, Konings, Rudy J. M
Format: Article
Language:English
Subjects:
Evolution
Formations
Lattice parameters
Nonlinearity
Origins
Oxides
Phases
Uranium
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Summary:Cubic fluorite-type phases have been reported in the U IV O 2 -Bi 2 O 3 system for the entire compositional range, but an unusual non-linear variation of the lattice parameter with uranium substitution has been observed. In the current extensive investigation of the uranium( iv ) oxide-bismuth( iii ) oxide system, this behaviour of the lattice parameter evolution with composition has been confirmed and its origin identified. Even under inert atmosphere at 800 °C, U IV oxidises to U V /U VI as a function of the substitution degree. Thus, using a combination of three methods (XRD, XANES and Raman) we have identified the formation of the BiU V O 4 and Bi 2 U VI O 6 compounds, within this series. Moreover, we present here the Rietveld refinement of BiU V O 4 at room temperature and we report the thermal expansion of both BiU V O 4 and Bi 2 U VI O 6 compounds. The non-linear variation of the lattice parameter in the U IV O 2 -Bi 2 O 3 system under inert atmosphere is due to the uranium oxidation.
ISSN:1477-9226
1477-9234
DOI:10.1039/c6dt00735j