In situ analysis for spontaneous reduction of Eu in LiCl pyroprocessing media at 923 K.

The spontaneous reduction of Eu to Eu was examined when EuCl was added into a pyroprocessing media of LiCl molten salt at 923 K. The amount of Eu was calculated by measuring the total charge consumed to oxidize Eu ions to Eu ions. The concentration ratio of Eu to Eu was estimated to be about 0.40 in the media. In addition, it is confirmed that the reduction of Eu to Eu is caused by the oxidation power of Cl to Cl. The coexistence of Eu and Eu in the LiCl molten salt system was examined by UV-Visible and luminescence spectroscopy. The molar absorptivities of Eu and Eu, calculated from UV-Visible absorption spectra, were 423 and 1954 M cm, respectively. [ABSTRACT FROM AUTHOR]