Thermodynamics of reaction of praseodymium with gallium–indium eutectic alloy

Abstract

a b s t r a c tThermodynamic properties of Ga-In eutectic alloys saturated with praseodymium were determine d for the first time employing the electromotive force method. The equilibrium potentials of the Pr-In alloys saturate d with praseodym ium (8.7-12.1 mol.% Pr) and Pr-Ga-In alloys (containing 0.0012-6.71 mol. % Pr) were measured between 573-1073 K. Pr-In alloy containing solid PrIn 3 with known thermodynamic properties was used as the reference electrode when measuring the pot entials of ternary Pr-In-Ga alloys. Activity, partial and excessive thermodynamic functions of praseodym ium in alloys with indium and GaIn eutectic were calculated. Activity (a), acti vity coefficients (c) and solubility (X) of praseodymium in the studied temperat ure range can be expressed by the following equations: lga aÀPr(In) = 4.425 À 11965/T ± 0.026. lga aÀPr(Ga-In) = 5.866 À 14766/T ± 0.190. lgc aÀPr(Ga-In) = 2.351 À 9996/T ± 0.39. lgX Pr(Ga-In) = 3.515 À 4770/T ± 0.20.

Thermodynamic properties of uranium in gallium–aluminium based alloys

“…7. The following equations provide the most adequate description of the experimental data: (5); solid Al (6). Lines 2e4 e present work (data points are omitted for clarity), data for the lines 1, 5 and 6 are from the literature [14,28,30] …”

Liquid Electrodes for An/Ln Separation in Pyroprocessing

“…They found that the theoretical separation order of An/Ln on different low-melting metallic medias in LiCl-KCl molten salt is: 15 In recent years, the Russian Academy of Sciences (RAS) and the Ural Federal University have also conducted a systematic research on the physicochemical and thermodynamic parameters (equilibrium potential, activity, activity coefficient and solubility) of uranium and lanthanide elements in liquid Ga-based cathode such as Ga-Al, Ga-Sn, Ga-In and other alloys due to the large thermodynamic An/Ln separation factor. [16][17][18][19][20][21][22][23][24][25] In addition, the CEA also studied the electrochemical behaviors of Gd, Ce, and Pu on liquid Ga cathodes in CaCl 2 and NaCl-KCl molten salts via electrochemical approaches and measured the related activity coefficients in liquid Ga. It was found that the Pu/Ce and Pu/Gd separation on a liquid Ga cathode is better than that on Al, Bi and Cd 26,27 ones.…”