Preparation and analysis of Pr-Ga-Al alloys

Pr-Ga-Al alloys were prepared from individual metals Pr, Ga, Al purified from oxide films in an inert atmosphere of the glove box. The metals were mixed in a certain proportion in crucibles and annealed at 832.4±1.7 °C and 366.2±6.3 °C for 19 hours and 53 hours re-spectively. Three ingots were obtained with different praseodymium content. X-ray phase analysis showed that the dominant phase of these alloys is PrGa6. A formation of Pr(GaAl)2 solid solution was also detected

Study of uranium solubility in gallium-indium eutectic alloy by emf method

Activity, activity coefficients and solubility of uranium in Ga-In eutectic alloy as well as activity of uranium in U-Ga and U-In alloys were determined between 573 and 1073 K using electromotive force (emf) method. © 2013 Pleiades Publishing, Ltd

Thermodynamics of reaction of praseodymium with gallium-indium eutectic alloy

Thermodynamic properties of Ga-In eutectic alloys saturated with praseodymium were determined for the first time employing the electromotive force method. The equilibrium potentials of the Pr-In alloys saturated with praseodymium (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 PrIn3 with known thermodynamic properties was used as the reference electrode when measuring the potentials of ternary Pr-In-Ga alloys. Activity, partial and excessive thermodynamic functions of praseodymium in alloys with indium and Ga-In eutectic were calculated. Activity (a), activity coefficients (γ) and solubility (X) of praseodymium in the studied temperature range can be expressed by the following equations: lgaα-Pr(In) = 4.425 - 11965/T ± 0.026. lgα-Pr(Ga-In) = 5.866 - 14766/T ± 0.190. lgγα-Pr(Ga-In) = 2.351 - 9996/T ± 0.39. lgPr(Ga-In) = 3.515 - 4770/T ± 0.20. © 2013 Elsevier B.V. All rights reserved

Thermodynamic properties of uranium in Ga-In based alloys

Activity of uranium was determined in gallium, indium and gallium-indium eutectic (21.8 wt.% In) based alloys between 573 and 1073 K employing the electromotive force method. In two-phase U-Ga-In alloys, uranium forms the intermetallic compound UGa3. Activity coefficients and solubility of uranium in Ga-In eutectic were also determined in the same temperature range. Partial thermodynamic functions of γ-U in saturated alloys with gallium, indium and Ga-In eutectic were calculated. © 2013 Elsevier B.V. All rights reserved

Thermodynamic properties of lanthanum in gallium-indium eutectic based alloys

Activity and activity coefficients of lanthanum were determined for the first time in gallium-indium eutectic based alloys in a wide temperature range employing electromotive force method. Activity of β-La and super cooled liquid lanthanum in Ga-In eutectic based alloys between 573 and 1073 K linearly depends on the reciprocal temperature: lgaβ-La(Ga-In)=5.660-15, 352T±0.093 lgaLa(Ga-In)=6.074-15,839T±0.093 Activity coefficients of β-La and super cooled liquid lanthanum in this system at 617-1073 K are described by the following equations: lgγβ-La (Ga-In)=3.786-12,216T±0.171 lgγLa(Ga-In)=4. 199-12,703T±0.171 In addition activity of lanthanum in alloys with In was also determined in the same temperature range. © 2012 Elsevier B.V. All rights reserved

Excessive thermodynamic properties of praseodymium in a gallium-indium alloy

The equilibrium potentials of praseodymium-diluted homogeneous Pr-Ga-In alloys in a (Li-K-Cs)Cleut-based salt electrolyte were measured between 573-1073 K by the emf method. These potentials are used to calculate the activity coefficients of α-praseodymium in liquid Ga-In eutectic alloys. PrIn3 alloy with well-known thermodynamic characteristics and without phase transitions in the temperature range 428-1483 K was employed as the reference electrode. © 2013 Pleiades Publishing, Ltd

Preparation and analysis of Pr-Ga-Al alloys

Pr-Ga-Al alloys were prepared from individual praseodymium, gallium and aluminum purified from oxide films in an inert atmosphere of the glove box. The Ga-Al phase diagram was used to choose the eutectic composition (2.1 mol. % Al). The metals were mixed in a certain proportion in crucibles (BeO) and annealed at 832.4±1.7 °C and 366.2±6.3 °C for 19 hours and 53 hours, respectively. Three ingots were obtained with different praseodymium content. The alloys were investigated by X-ray phase analysis, scanning electron microscopy and electron backscatter diffraction technique. A general chemical analysis was also performed. Depending on praseodymium content the alloys consisted of PrGa6 intermetallic compound phase; a mixture of PrGa6 and ϵ-PrGa2 IMCs; and ϵ-PrGa2 phase. Ternary intermetallic compounds of praseodymium were not detected. A small addition of aluminum does not affect the phase characteristics of intermetallic compounds of praseodymium in alloys. © 2019 Author(s)

THERMODYNAMICS OF U IN GA-SN EUTECTIC ALLOY

Thermodynamic properties of uranium were studied in U-Ga, U-Sn and U-Ga-Sn systems. Activity and activity coefficients of uranium were determined in alloys with tin and gallium-tin eutectic (13.5 wt.% Sn) between 573 and 1073 K. Solubility of uranium in Ga-Sn eutectic and in pure Sn was measured between 298 and 1073 K. Activity coefficients of uranium in alloys with Ga, Sn and Ga-Sn eutectic were calculated

THERMODYNAMICS OF INTERACTION OF PRASEODYMIUM WITH GALLIUM-ALUMINUM EUTECTIC ALLOY

Thermodynamics of interaction of Pr with Ga-Al eutectic alloy was studied employing the EMF method. Thorough mathematical processing of obtained EMF temperature dependences measured between metal Pr and two-phase Pr-Ga-Al alloys allows us to conclude thattwo peritectic reactions of intermetallic compounds (IMC) have had happened. Temperatures of both reactions decently correspond to phase transitions of well-known IMCs of Pr with Ga. It indicates that prereferentially interacts with gallium