Abstract
Thermodynamic properties of neptunium in LiCl‐KCl eutectic/liquid bismuth systems in the temperature range 400–500°C have been studied using a galvanic cell method for the pyrometallurgical reprocessing of nuclear spent fuels. The standard potential of the Np/Np(III) couple vs. the Ag/AgCl (1 wt % AgCl) reference electrode in LiCl‐KCl eutectic was measured and given by the equation , where E is in volts, T is in kelvin, and σ is the standard deviation. The potential of neptunium‐bismuth alloy, , was measured as a function of neptunium concentration, . The curves for vs. log indicated the neptunium solubility in liquid bismuth to be 0.34 ± 0.02, 0.61 ± 0.08, and 1.06 ± 0.09 (±σ) atom % at 400, 450, and 500°C, respectively. The excess partial free energy of neptunium in liquid bismuth was represented by the equation, . The values of the solubility and excess partial free energy for neptunium were closer to those for plutonium rather than uranium. © 2000 The Electrochemical Society. All rights reserved.
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