Abstract
Knowledge of the phase equilibria of the Sn-Sb-Ag ternary system is of fundamental importance in Sn-Sb-based solder applications. Thermodynamic models of the ternary Sn-Sb-Ag system and the binary Sb-Ag and Sn-Ag systems are developed using the calculation of phase diagrams (CALPHAD) method. The calculated 250 °C isothermal section, liquidus projection, and thermodynamic properties are in good agreement with the experimental results. There are two continuous solid solutions formed between the ε-Ag 3 Sn and ε-Ag 3 Sb, and ζ -Ag 17 Sb 3 and ζ-Ag 5 Sn phases, but there is no ternary compound. There are three class II ternary invariant reactions, L + Sb ↔ ε + β-SnSb, L + β-SnSb ↔ Sn 3 Sb 2 + ε, and L + Sn 3 Sb 2 ↔ Sn + ε. Their reaction temperatures are 379 °C, 313 °C, and 231 °C, respectively. © The Minerals, Metals & Materials Society and ASM International 2008.