Abstract
Anodic dissolution of niobium in molten NaCl-KCl yielded sparingly soluble NbCl 3 at low current densities and blue solutions of Nb(IV) at high current densities, whereas only Nb(IV) solutions were produced from Nb and molten LiCl-KCl. Reduction of Nb(III) to metal occurred at ~ −1.5 V vs. Cl− Cl 2 but Nb(IV) solutions were reduced by a more complex process probably involving alkali metal as an intermediate. Some approximate values of E 0 for the niobium oxidation states and of ΔG f 0 for the chloride solutions have been evaluated.
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