The thermodynamic assessment of the Co–Sb system

• Published in: Calphad 2008-03, Vol.32 (1), p.56-63
• Main Authors: Zhang, Yubi, Li, Changrong, Du, Zhenmin, Geng, Tai
• Format: Article
• Language: English
• Subjects: Co–Sb system; 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; Thermodynamic assessment
• ISSN: 0364-5916; 1873-2984
• DOI: 10.1016/j.calphad.2007.11.001

The Co–Sb system has been assessed thermodynamically based on the experimental data of both the phase equilibria and the thermochemical properties. The reasonable models were constructed for all the phases of the system. The liquid and the terminal solid solution phases, ( α Co ) and ( ε Co ), were described as the substitutional solution model while the (Sb) phase was treated as the pure element Sb for lack of the solubility data of Co in (Sb). The ( β CoSb ) phase was modelled by three-sublattices, Sb: Co, Va: Va, Co, since its structure is of the NiAs-type (B8 1) with the Co vacancies on the Sb-rich side and the interstitial Co atoms on the Co-rich side. The compounds γ CoSb 2 and δ CoSb 3 were expressed as the stoichiometric compounds. Much attention has been paid to the consistence between the experimental measurements and the theoretical calculations. Using the present thermodynamic data, the calculation results can reproduce the experimental data well.