Abstract
Thermodynamic properties of dissolved in the molten LiCl salt at 900 K were explored using electrochemical methods. It was difficult to determine precisely the decomposition voltage of dissolved in the molten salt by cyclic voltammetry. The oxidation wave of ion could not be located with high accuracy. However, the lithium activity of the Pb-Li alloy in equilibrium with the molten salt containing dissolved under nitrogen atmosphere could be measured electrochemically with high accuracy using the reference electrode. Under the conditions used in this study, the potential of the Li-Pb electrode is equal to the decomposition voltage of The activity of in molten LiCl was determined for anionic fractions of ranging from to 0.028. The nitride ion concentration in the salt was determined by chemical titration. The activity coefficient of the at high dilution was found to be very low, around The activity coefficient increases sharply with composition and has a value of 0.25 at © 2001 The Electrochemical Society. All rights reserved.
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