ChemInform Abstract: Electrochemical and Spectroscopic Studies of Tungsten Hexachloride in an Acidic Sodium Chloroaluminate Melt. Determination of Dissolved Oxide.

Abstract

ChemInform Abstract In an acidic sodium chloroaluminate melt (63 mol% AlCl3), WCl6 undergoes several reduction steps, the first of which is sensitive to oxide impurities and possibly can be used for the quantitative determination of oxide in such melts. UV/VIS and IR absorption measurements indicate that WCl6 reacts with oxide to produce WOCl4. Comparison with the electrochemical data indicates that the first voltammetric wave is caused by the reduction of WCl6 to WCl5 (E1/2 = 1.665 V vs. Al/Al3+ in the same melt) and that WOCl4 is electroactive only below +1.5 V.

Electrodeposition of Tungsten in ZnBr2 ‐ NaBr and ZnCl2 ‐ NaCl Melts

“…It is noted that the cathodic peak C1, which is attributed to the reaction W(IV) + 2e ~ W(II), was absent in the voltammogram of W(VI) (Fig. The absence of the peak C1 and the lower rest potential for W(IV) may be interpreted in terms of the effect of oxide impurities as described by Schoebrechts et al (36). 3) was lower than that in the melt containing W(IV) (910 mV, Fig.…”