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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-1.95V 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 723–843K.The activities of Pr in the Pr-Al intermetallic compounds were calculated.
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 one-step three-electron reaction. The reversibility of Pr 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.