Thermodynamic investigation of the Pb – Sb system

• Published in: Journal of alloys and compounds 2009-05, Vol.476 (1), p.74-78
• Main Authors: Hassam, S., Boa, D., Fouque, Y., Kotchi, K.P., Rogez, J.
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; DLLRC; DSC; Enthalpy of mixing; Exact sciences and technology; Lead–antimony system; Materials science; Optimization; Phase diagram; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Physics; Thermal properties of condensed matter; Thermal properties of crystalline solids; Thermodynamic properties
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2008.09.002

The enthalpies of mixing of lead – antimony alloys were determined at 973 K in the range 0.2 < X Sb < 0.6 by direct liquid–liquid reaction calorimetry (DLLRC). The results are compared with data of the literature. The mixing enthalpies in the Pb – Sb liquid phase are weakly negative over the entire investigated concentration range with a minimum at Δ mix H m = −70 J mol −1 at X Sb = 0.4. In addition, the Pb – Sb phase diagram on the Pb-rich side was revised using differential scanning calorimetry (DSC). The coordinates of the eutectic point have been ensured. An optimization of the binary Pb – Sb system was finally performed. The calculated phase diagram and thermodynamic functions agree well with experimental data.