Enthalpies of formation of liquid and solid binary alloys based on 3d metals

Abstract. The present study concerns the optimization of the Fe-Y and Ni-Sc systems by the help of the CALPHAD (CALculation of Phase Diagram) method, taking into account the available experimental results about phase equilibria and thermodynamic properties. The excess terms of the Gibbs energy of the solution phases (liquid, b.c.c., f.c.c. and h.c.p.) were assessed with the recent exponential temperature dependence of the interaction energies by Kaptay and compared with the linear dependence by Redlich-Kister. Furthermore, the computer program Thermo-Calc allows to obtain estimated data for experimentally undetermined thermodynamic properties and to compare the computed phase diagrams with those already published.

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“…10 is compared with the experimental ones □ at T=988 K [45], ○ [38] and predicted Δ [46]. A reasonable agreement is noted.…”

Section: Resultsmentioning

confidence: 53%

“…% Sc have been determined by high temperature calorimetry by [44] and the enthalpies of formation of the compounds have been measured by [45]. The predicted ones are listed in [46]. Furthermore, the Gibbs'energy change during the formation of the different compounds from the solid components have been determined at T=988 K by [47].…”

Section: Ni-sc Systemmentioning

confidence: 99%

Thermodynamic assessments of the Fe-Y and Ni-Sc systems

Kardellass

Servant

Selhaoui

et al. 2013

MATEC Web of Conferences

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“…3 gives calculated formation enthalpies of solid, ordered, equimolar intermetallic Compounds. They were calculated [6] on the basis of the Miedema model [14], Formation enthalpies around zero indicate a high solubility in the solid State or mixed crystal formation, values below +40 kJ/mol point towards limited solubility, and values above +40 kJ/mol towards insolubility [43].…”

Section: Promotion and Inhibition Of Actinide Oxide Reductionmentioning

confidence: 99%

An Atomic Beam Source for Actinide Elements: Concept and Realization

et al. 1997

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Atomic beams /Actinide elements / Resonance ionization mass spectroscopy / Volatilization SunmiaryFor ultratrace analysis of actinide Clements and studies of their atomic propcrties with resonance ionization mass spectroscopy (RIMS), efficient and stable sources of actinide atomic beams are required. The thermodynamics and idnetics of the evaporation of actinide elements and oxides from a variety of metals were considered, including diffusion, desorption, and associative desorption. On this basis various sandwich-type filaments were studied. The most promising system was found to consist of tantalum as the backing material, an electrolytically deposited actinide hydroxide as the source of the element, and a titanium covering layer for its reduction to the metal. Such sandwich sources were experimentally proven to be well suited for the production of atomic beams of plutonium, curium, berkelium and califomium at relatively low operating temperatures and with high and reproducible yields.

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“…An important question is whether the metal exchange reaction is thermodynamically favorable. Using estimated enthalpies of formation for Mn (As,Sb) [32] and In Ga . A simple thermodynamic argument was used to explain trends in surface reactivity for Mn deposition on to different GaAs and InSb reconstructed surfaces [34], but in that case there was no incident group V flux and the temperature was fixed.…”

Section: Discussionmentioning

confidence: 99%