Redox equilibrium of the UO22+/UO2+ couple in Li2MoO4–Na2MoO4 eutectic melt at 550°C

•The UO22+/UO2+ redox reaction in Li2MoO4–Na2MoO4 eutectic was clarified.•The redox potential was evaluated by using the spectrophotometric technique.•The standard redox potential was determined to be −0.847±0.010V vs. O2/O2−. The redox equilibrium of UO22+/UO2+ couple was measured in Li2MoO4–Na2MoO...

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Published in:Journal of nuclear materials 2014-11, Vol.454 (1-3), p.159-163
Main Authors: Nagai, Takayuki, Uehara, Akihiro, Fujii, Toshiyuki, Sato, Nobuaki, Kofuji, Hirohide, Myochin, Munetaka, Yamana, Hajimu
Format: Article
Language:English
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Summary:•The UO22+/UO2+ redox reaction in Li2MoO4–Na2MoO4 eutectic was clarified.•The redox potential was evaluated by using the spectrophotometric technique.•The standard redox potential was determined to be −0.847±0.010V vs. O2/O2−. The redox equilibrium of UO22+/UO2+ couple was measured in Li2MoO4–Na2MoO4 eutectic melt at 550°C by cyclic voltammetry and absorption spectrophotometry. The standard redox potential of UO22+/UO2+ couple was approximately evaluated by cyclic voltammetry. Further, the absorption spectrum and equilibrium potential were measured, repeatedly adding UO22+ source material into the melt containing UO2+. From the correlation between the equilibrium potential of the melt and the concentration ratio [UO22+]/[UO2+] spectrophotometrically evaluated, the standard redox potential of UO22+/UO2+ couple was determined to be −0.847±0.010V vs. O2/O2−.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2014.07.070