Electrochemical behavior of praseodymium and Pr-Al intermetallics in LiCl-KCl-AlCl₃-PrCl₃ melts

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• 作者：Hao TANG ((唐 浩))^a ; ^{haotang@caep.cn" class="auth_mail" title="E-mail the corresponding author} ; Hui DENG ((邓 辉))^a ; Qingbo REN ((任清波))^a ; Dingzhou CAI ((蔡定洲))^a ; Yiming REN ((任一鸣))^a ; Lang SHAO ((邵 浪))^a ; Yongde YAN ((颜永得))^b ; ^{y5d2006@hrbeu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Milin ZHANG ((张密林))^b
• 关键词：molten chlorides ; Pr-Al intermetallics ; electrochemical behavior ; thermodynamic properties ; activity ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：34
• 期：4
• 页码：428-434
• 全文大小：884 K

文摘

The electrochemical behavior of Pr(III) and formation process of Pr-Al intermetallics were investigated by different electrochemical methods. The reduction of Pr(III) ion to metallic Pr is an one-step three-electrons reaction. The reversibility of Pr(III)/Pr(0) system was evaluated by cyclic voltammograms with different scan rates. The co-reduction of Pr(III) and Al(III) ions formed three different Pr-Al intermetallics at electrode potentials around −1.40, −1.80, and −1.95 V vs. Ag/AgCl at 723 K, respectively. Open-circuit chronopotentiometry and electromotive force (emf) measurements were carried out to estimate the relative molar Gibbs energies of Pr for the formation of different Pr-Al intermetallics in the temperature range of 723–843 K. The activities of Pr in the Pr-Al intermetallic compounds were calculated.