Thermophysical properties of the liquid Pb84.1Au15.9 eutectic 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 •
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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.