caa a22 4500 465732593 CHVBK 20180323111745.0 cr unu---uuuuu 170327e19901101xx s 000 0 eng 10.1007/BF02117562 doi (NATIONALLICENCE)springer-10.1007/BF02117562 Electrochemistry of uranium in sodium chloroaluminate melts [Elektronische Daten] [W. D'olieslager, F. Meuris, L. Heerman] The electrochemical behaviour of uranium has been studied in basic, NaCl-saturated NaAlCl4 melts at 175°C. Solutions of UO3 exhibit two oxidation/reduction waves (cyclic voltammetry). The first wave corresponds to the U(VI)/U(IV) redox couple and is irreversible (slow electron transfer). The second wave corresponds to the deposition and stripping of an insoluble U(III) compound (U(IV)/U(III)). Solutions of UO2 or UCl4 and U(IV) solutions prepared by exhaustive electrolysis of UO3 behave identically. The cyclic voltammograms of U(IV) solutions are the same as those of UO3, but they show additional anodic peaks. Analysis of the peak currents (cyclic voltammetry), the limiting currents (pulse polarography) and the non-linear log i-t curves (anodic controlled potential coulometry) leads to the conclusion that uranium (IV) in the basic chloroaluminate melt exists as two different species in slow equilibrium with one another, of which only one species can be oxidized to U(VI). E.m.f. measurements of U(VI)-U(IV) mixtures indicate that the electron transfer process involves the formation of an intermediate U(V) species in a disproportionation equilibrium. Akadémiai Kiadó, 1990 D'olieslager W. Laboratorium Radiochemie, K. U. Leuven, Celestijnenlaan 200 G, 3030, Heverlee, (Belgium) aut Meuris F. Laboratorium Radiochemie, K. U. Leuven, Celestijnenlaan 200 G, 3030, Heverlee, (Belgium) aut Heerman L. Laboratorium Radiochemie, K. U. Leuven, Celestijnenlaan 200 G, 3030, Heverlee, (Belgium) aut Journal of Radioanalytical and Nuclear Chemistry Articles Springer Netherlands 143/1(1990-11-01), 199-211 0236-5731 143:1<199 1990 143 10967 https://doi.org/10.1007/BF02117562 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02117562 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- D'olieslager W. Laboratorium Radiochemie, K. U. Leuven, Celestijnenlaan 200 G, 3030, Heverlee, (Belgium) aut NATIONALLICENCE 700 1- Meuris F. Laboratorium Radiochemie, K. U. Leuven, Celestijnenlaan 200 G, 3030, Heverlee, (Belgium) aut NATIONALLICENCE 700 1- Heerman L. Laboratorium Radiochemie, K. U. Leuven, Celestijnenlaan 200 G, 3030, Heverlee, (Belgium) aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Articles Springer Netherlands 143/1(1990-11-01), 199-211 0236-5731 143:1<199 1990 143 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer