Thermodynamic re-assessment of the Ni – Sn system

Abstract The Ni – Sn system was critically re-assessed by means of the CALPHAD technique. The excess Gibbs energies of the solution phases (liquid, fcc (Ni) and bct (Sn)) were modeled with the Redlich–Kister equation. Five intermetallic compounds, Ni 3 Sn_HT (which is stable at high temperature), Ni 3 Sn_LT (which is stable at low temperature), Ni 3 Sn 2 _HT, Ni 3 Sn 2 _LT and Ni 3 Sn 4 in the Ni – Sn system were treated as the formula (Ni,Sn) 1/4 (Ni,Sn) 1/4 (Ni) 1/2 , (Ni,Sn) 3/4 (Ni,Sn) 1/4 , (Ni) 1/3 (Ni,Sn) 1/3 (Sn) 1/3 , (Sn) 1/5 (Ni,Sn) 2/5 · (Ni) 2/5 , and (Ni) 1/4 (Ni,Sn) 1/4 (Ni) 1/2 , respectively. A set of self-consistent thermodynamic parameters of the Ni – Sn system was obtained.