Abstract
Activity, activity coefficients and solubility of uranium was determined in gallium, indium and gallium–indium alloys containing 21.8 (eutectic), 40 and 70wt.% In. Activity was measured at 573–1073K employing the electromotive force method, and solubility between room temperature (or the alloy melting point) and 1073K employing direct physical measurements. Activity coefficients were obtained from the difference of experimentally determined temperature dependencies of uranium activity and solubility. Intermetallic compounds formed in the respective alloys were characterized using X-ray diffraction. Partial and excess thermodynamic functions of uranium in the studied alloys were calculated. Liquidus lines in U–Ga and U–In phase diagrams from the side rich in gallium or indium are proposed.
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