Electrochemical behavior, niobium

The electrochemical behavior of niobium in different types of molten electrolytes and the influence of ligand substitution in niobium-containing complex ions on the reduction mechanism is comprehensively reviewed by Polyakov [555]. 

Use of low-temperature molten systems for electrolytic processes related with tantalum and niobium and other rare refractory metals seems to hold a promise for future industrial use, and is currently of great concern to researchers. The electrochemical behavior of tantalum, niobium and titanium in low-temperature carbamide-hilide melts has been investigated by Tumanova et al. [572]. Electrodeposition of tantalum and niobium from room/ambient temperature chloroaluminate molten systems has been studied by Cheek et al. [573],... 

The electrochemical behavior of Nb(V) in oxide free basic aluminum chloride -methyl-3-ethylimidazolium chloride - is reported to involve four reduction steps, but reduction to the free metal could not be achieved [1, 2]. Niobium and tantalum chloride cluster cores of the type [M6C1i2] (M=Nb or Ta) in this same ionic liquid have been studied in detail by electrochemical and spectroscopic methods and their behavior compared with the behavior of these systems in an MeCN electrolyte. Four reversible redox states are observed in the span z = 2-5 [3, 4]. 

Elizarova I.R., Polyakov E.G. and Polyakova L.P., Electrochemical behavior of niobium in CsCl-KCl-NaCl-NbC15, (1991), Elektrokhem., 27, 640-647. 

Lantehne, R, Barhoun, A. and Chevalet, J. (1993) Electrochemical behavior of solutions of niobium chlorides in fused alkali chlorides. J. Electrochem. Soc., 140(2), 324-331. 

N. Boes, H. Zuechner, Study of the solubihty behavior of hydrogen in vanadium, niobium and tantalum using an electrochemical method, Ber. Bunsenges. Phys. Chetn. 80 (1976) 22—27. 

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