Croatica Chemica Acta, Vol. 60 No. 2, 1987.
Original scientific paper
Electrochemical Reduction of Indium (III) in Molten Lithium Chloride - Potassium Chloride Eutectic
B. N. Popov
; Faculty of Technology and Metallurgy, University »Kiril and Metodij«, Skopje, Yugoslavia
J. V. Ivshin
; Chemical and Technological Institute, »S. M. Kirov«, Kazan, USSR
Abstract
The dependence of indium electrode potential vs. log. concentration
of indium (III) is linear and the slopes determined are comparable with the slopes calculated from the Nernst equation, assuming n = 3. The potential of In/ln(III) has been determined to be 0.805 ± 0.003 V with respect to Pt/PtC12 (1 M). At 693 K the free energy of formation of the indium(III) chloride in a 1 M solution is -325, 398 ± 500 JImo!.
Asingle chronopotentiometric wave is observed for the reduction
of InC13 at -0.81 V vs the Pt(II)/Pt reference electrode. Based on analytical data n = 3, the diffusion coefficient was calculated to be 1.81 X lO-s cm- S-l. The values of a na and kOf•h were calculated to be 0.6 and 3.25 X 10-3 cm S-l. Chronopotentiometry showed one step for the reduction of In 203. The quarter wave potential was found to be -0.7 V vs. the Pt(II)/Pt reference electrode. The reduction was found not to be a diffusion controlled process over the time interval investigated. It was shown that In203 is not stable in the melt ann
enters in an acid-base reaction with the chloride melt.
Keywords
Hrčak ID:
176361
URI
Publication date:
25.6.1987.
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