Abstract
In the present study, the concentration-dependent activity and activity coefficients of K and Li in liquid bismuth at 973 K and 1023 K were determined by electromotive force measurement (emf) which was performed in an electrochemical cell: K (Li)-Bi (reference) || molten salt electrolyte || liquid Bi (working). Instead of simply mixing Bi and K or Li for different compositions of working electrode, various compositions of the working electrode were acquired by coulometric titrating different quantities of K and Li into liquid bismuth through chronopotentiometry electrolysis. The present method of tracking the change of activity and activity coefficient can be continuously operated for multiple measurements with different Bi-K/Li compositions, therefore, the measurements can provide a more accurate relationship between activity coefficient and the concentration of K (Li) in liquid Bi.
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