Thermodynamic properties of uranium in gallium–aluminium based alloys

Activity, activity coefficients and solubility of uranium was determined in gallium-aluminium alloys containing 1.6 (eutectic), 5 and 20 wt.% aluminium. Additionally, activity of uranium was determined in aluminium and Ga–Al alloys containing 0.014–20 wt.% Al. Experiments were performed up to 1073 K. Intermetallic compounds formed in the alloys were characterized by X-ray diffraction. Partial and excess thermodynamic functions of U in the studied alloys were calculated. •Thermodynamics of uranium is determined in Ga–Al alloys of various compositions.•Uranium in the mixed alloys interacts with both components, Ga and Al.•Interaction of U with Al increases with decreasing temperature.•Activity and solubility of uranium depend on Al content in Ga–Al alloys.