Journal article
Electrochemical investigation on the redox chemistry of niobium in LiCl-KCl-KF-Na2O melts
In
Journal of the Electrochemical Society
—
1997, Volume 144, Issue 10, pp. 3435-3441
Abstract
The system LiCl-KCl-KF-1 mole percent K2NbF7 (molar ration F-/Nb = 8) has been investigated in-the temperature range 370 to 725 degrees C by cyclic and square wave voltammetry. In the temperature range from 370 to 520 degrees C Nb(V) was reduced to Nb(III) in two reversible steps: Nb(V) --> Nb(IV) --> Nb(III).
At these temperatures subvalent halides of niobium were formed at more negative potentials. At temperatures above 660 degrees C metallic niobium was formed during reduction. When oxide (molar ratio O2-/Nb = 1.1) was introduced in the melt at 725 degrees C only minor changes were observed in the voltammograms.
It is suggested that oxide addition mainly leads to precipitation of oxide containing compounds.
| Language: | English |
|---|---|
| Publisher: | The Electrochemical Society |
| Year: | 1997 |
| Pages: | 3435-3441 |
| ISSN: | 19457111 and 00134651 |
| Types: | Journal article |
| DOI: | 10.1149/1.1838029 |
| ORCIDs: | Bjerrum, Niels |
