Energetics of Silver Alloys. Enthalpies of Mixing and Formation in the Systems Silver–Aluminium and Silver–Tin

Abstract

Abstract The paper presents values of the enthalpies of mixing and formation in the systems Ag–Al and Ag–Sn. Appropriate polynomial functions for the composition dependence of the enthalpies of mixing and formation and their partial molar quantities are given. The behaviors of the integral and partial molar enthalpies of mixing and formation are discussed. The trend of the enthalpy of formation in the system silver–tin points out the existence of the compound Ag–Sn in the solid state. The enthalpy of formation in the system Ag–Sn depends insignificantly on the temperature, while that in the system Ag–Al displays a pronounced temperature dependence which is attributed to lattice defects in the structure. A pronounced temperature dependence of the enthalpy of formation seems, therefore, not to be a general property of all metallic alloys.