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Electrochemical study of tantalum tetrachloride in the LiCl-KCl eutectic melt

✍ Scribed by T. Suzuki


Publisher
Elsevier Science
Year
1970
Tongue
English
Weight
739 KB
Volume
15
Category
Article
ISSN
0013-4686

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✦ Synopsis


The electrolytic reduction and oxidation of TaCl, in the LiCl-KC1 eutectic meIt have been studied by chronopotentiometric and coulometric measurements at 500, 600 and 675Β°C. It has been found that the reduction occurs in two steps: a diffusion-controlled, reversible two-electron reaction from Ta(IV) to Ta(II), and an irreversible reaction from Ta(I1) to tantalum, and that the oxidation occurs in one step: a diffusion controlled, reversible one-ekztron reaction from Ta(IV) to Ta(V). R&n&-Nous avons &u&e, & 500, 600 et 675Β°C. les r&actions d' oxydo-rbduction du tetrachlorure de tantal en solution dans un mblange eutectique de chlorures de lithium et de potassium, par des mesures chronospotentiometriques et coulometriques. La reduction se fait en deux &apes: une diffusion control& reversible, qui transfert deux electrons et fait passer le tantal de l' &at(IV) a l' &at(II), et une r&action irreversible qui le fait passer de l' &at(II) a l' &at(O). L' oxydation se fait en une seule &ape: une diffusion control& reversible, qui transfert un electron et fait passer le tantal de l' Ctat(IV) a I' &at(V). Zusammer&ssang--Die elektrolytische Reduktion und Oxidation von TaCl, wurde chronopotentiometrisch und coulometrisch in einer eutektischen LiCl-KC1 Schmelze bei 500, 600 und 675Β°C untersucht. Das Ergebnis ist. die Reduktion Huft in zwei Stufen ab, einer reversiblen, diffusionsgesteuerten ZweielektronenreaktionCTaOV) -+ Ta(II)) und einer irreversiblen Reaktion(Ta(I[) --c Ta); die Oxidation erfolgt in einer Stufe, einer reversiblen, diffusionsgesteuerten Einelektronenreaktion(Ta(IV) + Tao).


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