Further insights into the chemistry of the Bi–U–O system. Issue 18 (11th April 2016)

• Record Type: Journal Article
• 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.
• Is Part Of: Dalton transactions. Volume 45:Issue 18(2016)
• Page Start: 7847
• Page End: 7855
• Publication Date: 2016-04-11
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c6dt00735j
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : The non-linear variation of the lattice parameter in the U IV O2 –Bi2 O3 system under inert atmosphere is due to the uranium oxidation. Abstract : Cubic fluorite-type phases have been reported in the U IV O2 –Bi2 O3 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 O4 and Bi2 U VI O6 compounds, within this series. Moreover, we present here the Rietveld refinement of BiU V O4 at room temperature and we report the thermal expansion of both BiU V O4 and Bi2 U VI O6 compounds.