Electrochemical Study of Metallic Oxides in Fused Lithium Chloride-Potassium Chloride Eutectic

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Abstract
The oxygen electrode does not behave reversibly in at temperatures of 400°–500°C, and at oxide ion concentrations of 0.1–0.2M. The following electrode systems behave reversibly as electrodes of the second kind: ; ; ; . The and electrodes did not show reversible behavior. Because of the relatively high solubilities of the metal oxides, the applicability of the metal oxide electrodes to the measurement of oxide ion activity is limited to solutions containing oxide ion in concentrations comparable with, or greater than, that contributed by dissolution of the oxides. This limit is 10−3M or higher, depending on the system. The relatively high solubility of heavy metal oxides in this solvent is attributed to the great complexing tendency of chloride ion. It is probable that these oxides would be much less soluble in nitrate and sulfate melts and thus their utility as acidity electrodes could be extended to lower oxide concentrations.

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