Thermodynamic analysis of the Pt–Sn system

• Published in: Journal of alloys and compounds Vol. 450; no. 1; pp. 264 - 271
• Main Authors: Grolier, Vincent, Schmid-Fetzer, Rainer
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 14.02.2008; Elsevier
• Subjects: Associate model; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Phase diagram; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Physics; Platinum–tin; Thermodynamic modeling; Transition metal alloys and compounds; Transition metal alloys and compounds; Platinum–tin; Thermodynamic modeling; Associate model; Phase diagram; Phase diagrams; Platinum-tin; Intermetallic compounds; Platinum alloys; Entropy; Binary alloys; Tin alloys; Thermodynamic model; Solid solutions; Phase equilibria; Short-range order; Thermodynamic analysis; Chemical composition; Thermodynamic properties
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2006.11.027

A consistent thermodynamic description of the Pt–Sn system is generated using the Calphad method. Serious artifacts in a previous thermodynamic assessment of this system are pointed out. The thorough reassessment is based on all published original experimental data on phase equilibria and thermodynamic alloy properties, which have been critically evaluated. The associate solution model was used for the liquid phase with a strongly forming associate “PtSn” and the relevance for possible short-range order or cluster formation is discussed. The (Pt) solution phase is modeled as substitutional solution and the intermediate phases Pt 3Sn, PtSn, Pt 2Sn 3, PtSn 2, PtSn 4 are considered as stoichiometric phases. The assignment of reasonable values of thermodynamic parameters is further demonstrated by the consideration of absolute entropies and entropies of fusion of all the intermetallic compounds.