Abstract
The electrochemical processes of alkaline-earth ions in molten potassium nitrate were investigated by cyclic voltammetry on platinum. In Ca 2+/KNO 3 and Ba 2+/KNO 3 systems the same behaviour as that of Sr 2+/KNO 3 was found. Alkaline-earth oxides MO (CaO, SrO, BaO) were considered to be the final reduction products. The anodic process is dissolution of MO deposit, giving characteristic stripping peaks in the cyclovoltammograms. Some anodic curves obtained on sweep interruption (zero current) with various time duration give a qualitative indication about the solubilities of CaO, BaO and potassium oxide. Estimates of some kinetic parameters by two different methods were made. Thermodynamic calculated and experimental (cyclic voltammetry, chronopotentiometry) values of potential differences for K +, Ca 2+, Sr 2+, Ba 2+ ions pairs were also compared.
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