Thermodynamic properties of liquid Pu+In alloys

Лебедев, В. А.; Kober, V.I.; Serebryakov, V. G.; Kazantsev, G. N.; Nichkov, I.F.; Raspopin, S.P.; Skiba, O.V.

doi:10.1007/bf01118230

Cited by 9 publications

(29 citation statements)

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“…2. In the studied temperature range this dependence is non linear and has an inflection around 900 K. Similar inflection was previously reported [9] for the temperature depen dence of emf in U-Ga alloys around 920 K and explained by the existence of two modifications of UGa 3 intermetallic compound. Temperature depen dencies of emf of two phase Ga-In-U alloys at 569-1080 K calculated for two different uranium standard states are satisfactorily described by the following equations:…”

supporting

confidence: 88%

“…4. Uranium activ ity coefficients in Ga-In-U alloys are close to those in Ga-U alloys and below 670 K they are even some what lower that could be expected for uranium gal lium system according to Lebedev et al [9] but above those obtained by Johnson and Feder [12]. The temperature dependencies of uranium activity and activity coefficients obtained in the present work were used to calculate uranium solubility in Ga-In eutectic alloy at 573-1073 K and the following expres sion was obtained: (12) The temperature dependence of x U in Ga-In alloy is shown in Fig.…”

supporting

confidence: 56%

“…A possible reason for this, as pointed out by the authors themselves [13], is the presence in the gas phase of volatile gallium oxide together with gallium vapour. The literature contains data on uranium activity in the alloys with gallium or indium determined by emf method only at high tem peratures, from 643 K for Ga and from 626 K for indium [9,[11][12][13]. It was therefore of interest to determine uranium activity in alloys with gallium and indium at lower temperatures, 573-1073 K. The results obtained here for γ uranium (Fig.…”

mentioning

confidence: 90%

“…It is necessary to note that the set of data 2 in VOLKOVICH et al 5. Solubility of uranium in gallium (1 (line) [12], 2 (symbols) [10], 3 (symbols) [15]), Ga-In eutectic (4, present work), indium (5 [11], 6 [10,12]). …”

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

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1061 Salt melts and metallic alloys exhibit high thermal and radiation stability and thus are prospective work ing media for developing pyroelectrochemical meth ods of reprocessing spent nuclear fuels (SNF) and practical realization of short closed nuclear fuel cycle. Liquid state of metals and salts at relatively low tem peratures gives the simplest solution to one of the important tasks in radiochemical technology, the task of phase separation. It is obvious that detailed and reli able information concerning the behaviour of all SNF components, first of all uranium, in molten salt and liquid metal media is required for developing and improving pyroelectrochemical methods of SNF reprocessing. Existing literature [1] contains data on uranium behaviour in binary alloys with a number of low melting metals. Low melting metals can be effec tively employed for separating (selective extraction) of SNF components in a liquid metal-molten salt sys tem [2]. Alloys of low melting metals can be used instead of individual metals to lower melting point of the metallic phase and, thus, working temperature. However, we could not find information concerning the behaviour and thermodynamic properties of SNF components, particularly uranium, in ternary liquid metallic alloys. Ga-In eutectic alloy has one of the lowest melting points (T eut = 288.7-289.0 K) and is liquid even at room temperature.There is no information about the ternary Ga-In-U phase diagram. Of the corresponding binary systems only Ga-U alloys were studied in detail [5]. It appears that In-U phase diagram was not so far constructed. UMe 3 intermetallic compound (Me = Ga, In) is present in the equilibrium with the low melting com ponent. In both systems this intermetallic compound 1 The article was translated by the author.forms cubic crystals of AuCu 3 type with close cell parameters [3].The aim of the present work was experimental determination of uranium activity, activity coefficients and solubility in Ga-In eutectic based alloys between 573 and 1073 K.For determining thermodynamic characteristics of uranium in liquid metallic alloys the emf of the follow ing galvanic cell was measured:(-) U|chloride melt -UCl 3 |U + Ga-In eut (+).Low melting ternary LiCl-KCl-CsCl eutectic mixture (T m = 536 K) was employed as a chloride melt for preparing working electrolytes. The individual alkali metal chlorides used for preparing the solvent salt were purified using the procedure described earlier [4]. Melts containing uranium(III) chloride were obtained by anodic dissolution of metallic uranium with chlorine electrode acting as a cathode. Uranium concentration in the electrolytes was 3-5 wt %. GaIn alloys of the eutectic composition (21.8 wt % indium [5]) were prepared by fusing individual metals of 99.9999% (Ga) and 99.9995% (In) purity in an inert atmosphere dry box (MBraun Unilab 1200/780). Uranium containing alloys were obtained by adding metallic uranium or U-Ga alloy (contain ing ca. 5 wt % U) to the Ga-In eutectic or by cathod ically depositing uranium on the liqui...

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

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“…The enthalpies and entropies of formation of UBi, UBi 2 and U 3 Bi 4 in the range (745 to 842)°C were derived with the use of Bi vapour pressure measurements. Lebedev et al [26] studied the thermodynamic properties of (U + Bi) alloys at (496 to 788)°C using electromotive force (emf) measurements. The partial and integral thermodynamic properties (Gibbs energy, enthalpy and entropy of formation) of (U + Bi) alloys at 745°C were derived by Lebedev et al [26].…”

Section: (U + Bi) Binary Systemmentioning

confidence: 99%