Thermophysical properties of the Li(17)Pb(83)alloy (original) (raw)
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KfK 4]44 THERMOPHYSICAL PROPERTIES IN THE SYSTEM Li-Pb Part I: Preparation andcharacterization of Li(17)Pb(83) eutectic alloy and the Lipb intermetallic compound U. Jauch, V. Karcher, B. Schulz Part 11: Thermophysical properties of Li(17)Pb(83) eutectic alloy Abstract Part I: Preparation and Characterization of Li(17)Pb(83) eutectic alloy and the LiPb intermetallic compound Part 11: Thermophysical properties of Li(17)Pb(83) eutectic alloy Part 111: Estimation of the thermophysical properties in the system Li-Pb page 2 25 45 -1 -General Abstract This report describes the work performed on the determination of the thermophysical properties of alloys in the binary system lithium-lead, within the frame of theKfK-project of nuclear fusion technology. The preparation of the Li(J7)Pb(83) alloy and the intermetallic compound Lipb from the pure elements determines the contents of part I of the report, which includes too the characterization of the materials using chemical analysis, metallography, thermal and thermal differential analysis. The great importance of the characterization especially of the metallography is shown in presenting some results of the eutectic alloy fabricated by different producers under technical conditions. Because of the great importance of the thermophysical behaviour of the liquid eutectic Li(17)Pb(83) for the design of a liquid metal breeder blanket in the next European Torus, part 11 of the report describes the measurements and results of the thermodynamic properties (latent heat of fusion, specific heat, density, thermal expansion and surface energy) of this alloy. The results of the determination of the transport properties (thermal and electrical conductivity and viscosity) are presented, too. In part 111 the methods are given, which lead to an estimation of thermophys ical properties of Li-compounds with high Li-contents (> 50 at.%) in the solid state. -2 -THERMOPHYSICAL PROPERTIES IN THE SYSTEM Li-Pb Part I Preparation and Characterization of the Li(17)Pb(83) eutectic &lloy and the LiPb intermetallic compound U. Jauch, V. Karcher, B. Schu1z Kernforschungszentrum Kar1sruhe Institut für Materia1-und Festkörperforschung Abstract Li(17)Pb(83) and LiPb were prepared from the pure elements in amounts of seve-ra1 hundred grams. The reso1idified samp1es were characterized by me1ting points (eutectic temperature), chemica1 analysis and meta110graphy. Using differential thermal analysis the heats of fusion were determined and the behaviour of the intermetallic phase LiPb in vacuum and high purified He was studied. The resu1ts from these investigations were app1ied to characterize Contents List of figures List of tables page 47 48 1 •
Thermophysical properties of the liquid Pb84.1Au15.9 eutectic alloy
Journal of Nuclear Materials, 2013
Lead-gold eutectic alloy is under consideration as target material of spallation sources. The thermohydraulic design of such a target or related coolant systems requires a reliable data basis regarding the temperature dependent physical properties of such alloys. We present measurements of the electrical and thermal conductivity, thermoelectric power, viscosity and surface tension for liquid P b 84.1 Au 15.9 alloy of eutectic composition in a wide temperature range between the melting point and about 1000 K.
Properties and behaviour of 83Pb17Li eutectic
Fusion Engineering and Design, 1991
This article presents some test results of 83Pb-17Li euteetic properties. This eutectic was produced by induction melting in the form of ingots with a volume of 30 I. It should be noted that inhomogeneity of eutectic composition and structure was revealed within one and the same ingot. Annealing at temperatures below melting point changes the micro structure i.e. increasing of the size of the/]'-phase-particles takes place. The following values of euteetic thermal-physical properties were determined: enthalpy, specific heat capacity, thermal expansion, latent heat of melting. Some peculiarities of eutectic mechanical properties changing in the temperature range of 293 K to 473 K were investigated. * Here and further the values are presented in weight percents, unless specified otherwise. 0920-3796/91/$03.50 © 1991 -Elsevier Science Publishers B.V. (North-Holland)
Fusion Engineering and Design, 2011
Production of tons of 6 Li enriched Li-Pb eutectic (LME) is a next coming years demand for Test Blanket Programmes in ITER. EU R&D FT Programme is facing the establishment of LLE procurement plan for ITER and CIEMAT is leading such effort. LME production routes together with constitutive and compositional characteristics should be established according to nuclear material QA requirements. (IAEA ISOs). LLE materialǐs QA as; due to Li aggregation concerns have major impact on key design material properties for breeding blanket design. A case may be the value of Sievertǐs constant in lead-lithium which has a large impact on tritium control and on the design of auxiliary systems. The present work focus on establishing QA standard for the characterization of some key material properties: (1) accurate certification of Li title, (2) accurate certification of impurities content and (3) accurate assessment of structural homogeneity or Li-aggregation. Two different characterization techniques, DSC and ICP-MS analysis are qualified with different sampling materials origins; commercial (Stachow GmB, Germany) and R&D material from IPUL, Latvia. The proposed methodology and the experimental results obtained allows to measure the total amount of Li in the bulk alloy ingot and localized and determinate the segregation of Li (as Li in excess) generated in different parts of the ingot as a consequence of cooling thermal treatment.
Interatomic potential for the compound-forming Li–Pb liquid alloy
Journal of Nuclear Materials, 2014
Atomistic simulations of liquid alloys face the challenge of correctly modeling basic thermodynamic properties. In this work we present an interatomic potential for the Li-Pb system, as well as a study of physical properties of Li-Pb alloys. Despite the complexity due to Li-Pb being a compound forming system where charge transfer is expected, we show here how the empirical EAM formalism is able to satisfactorily describe several physical properties in a wide range of Li concentration. Application of our potential to Li-Pb eutectic allows us to correctly predict many physical properties observed experimentally and calculated with ab initio techniques, providing in this way a potential suitable for future studies in the context of tritium breeder blanket designs in Fusion technology.
Thermodynamic, structural, transport and surface properties of Pb- Tl liquid alloy
RCOST, 2015
Thermodynamic properties, such as free energy of mixing, heat of mixing, entropy of mixing, activities and the microscopic structural properties, such as concentration fluctuation in long-wavelength limit and chemical short-range order parameter of Pb-Tl liquid alloy at 773 K have been studied on the basis of regular associated solution model. We have estimated the mole fractions of the complex and the unassociated atoms assuming the existence of PbTl 3 complex as energetically favoured in the liquid state. The compositional contributions of the heat of mixing of the species Pb and Tl and the heat of formation of the compound to the net enthalpy change have also been studied. The transport properties such as, viscosity and the ratio of mutual and intrinsic coefficients have been studied using different approaches. The surface concentration of Tl atoms has been computed and it has been employed to calculate the surface tension of Pb-Tl liquid alloy. Both the theoretical and the experimental values of the concentration fluctuation in long-wavelength limit are found to be less than the ideal value, revealing that the concerned system is hetero-coordinating in nature. The interaction energies are found to be temperature dependent and respective alloy is found to be weakly interacting system. ©RCOST: All rights reserved.
Computer simulation of the liquid Li4Pb alloy
1985
Résumé Une simulation sur ordinateur de l'alliage liquide Li 4 Pb à 1085 K est présentée. Le calcul est fondé sur les potentiels de paire utilisés par Copestake et al. pour décrire la structure de ce système: interactions de Coulomb écrantées plus une répulsion de coeur mou. Les coefficients de diffusion ainsi que les fonctions de structure statiques et dynamiques sont évalués et comparés aux résultats expérimentaux. Les fonctions de corrélations de paires sont aussi calculées.
Study of Thermodynamic Properties of Bi-Pb Liquid Alloy
Journal of Nepali Physical Society, 2022
We have used quasi-lattice theory to describe the mixing behavior of Bi-Pb liquid alloys at a temperature of 700K by computing thermodynamic functions and structural functions. The thermodynamic functions includes free energy of mixing(G M), activity (a), heat of mixing (H M), entropy of mixing (S M). The structural functions includes concentration fluctuation in the long-wavelength limit (S cc (0)) and chemical short range order parameter (α 1). Most of the computed values are in good agreement with the experimental data. The pair-wise interaction energies between the species of the liquid alloys play important role and are found to temperature dependent. Theoretical analysis suggests that Pb 3 Bi complex exists in the liquid state at 700K. And, it has hetero-coordination (i.e. ordering) nature but is of weakly interacting in nature.
Thermodynamics and characterisation of alloys in Sb–PbBieut section in ternary Pb–Bi–Sb system
Thermochimica Acta, 2003
The results of thermodynamic investigation and characterisation of alloys in the Sb-PbBi eut section in ternary Pb-Bi-Sb system are presented in this paper. Experimental calorimetric investigations were done according to Oelsen's method, while general solution model was applied for thermodynamic predicting. Activities, activity coefficients, partial molar quantities for antimony and integral molar quantities were obtained at temperature of 873 and 973 K. Also, characterisation of the obtained alloys was done according of DTA and optic microscopy.
Molecular dynamics study of Li0.6Pb0.4 binary alloy using first principle
IJARIIT, 2018
In this work dynamics of the liquid binary, alloy Li0.6Pb0.4 have been studied at the melting temperature by considering the system of the alloy as an assembly of effective atoms. Norm conserving pseudopotentials have been calculated using the first principle approach. Calculations performed for LiPb alloy use standard pseudopotential theory, which is second-order perturbation and include dielectric screening as well. Velocity Autocorrelation function, Phonon dispersion and power spectrum have been calculated. The calculated results are in good agreement with experimental results.