| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1258911 | Journal of Rare Earths | 2016 | 7 Pages |
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.
Graphical AbstractCyclic voltammogram in LiCl-KCl eutectic melts on a tungsten electrode (S=0.322 cm2) at 723 K with an Al(III) solution cAl(III)=1.148×10−4 mol/cm3 (red line), a Pr(III) solution of cPr(III)=1.481×10−4 mol/cm3 (blue line) and a solution of Al(III) cAl(III)=1.005×10−4 mol/cm3 and Pr(III) cPr(III)=1.548×10−4 mol/cm3 (black line). Scan rate: 0.1 V/sFigure optionsDownload full-size imageDownload as PowerPoint slide
