Measurements of Thermodynamic Quantities for Molten Ag₂S-Sb₂S₃ and Cu₂S-Ni₃S₂ Systems by Quantitative Thermal Analysis

Abstract

Measurements of thermodynamic quantities for the molten Ag₂S-Sb₂S₃ and Cu₂S-Ni₃S₂ binary mixtures were carried out by quantitative thermal analysis of the heating process. A double adiabatic wall calorimeter was used as the experimental apparatus. A proper experimental condition to determine enthalpies of the sulfide mixtures was established.
Considerably large negative deviations from Raoultian behaviors were observed in a_Ag2S and a_Sb2S3 of the Ag₂S-Sb₂S₃ system at 1123 K, double sulfide compounds seriously affecting the activities. While, slight deviations were observed in a_Cu2S and a_Ni2S2 of the Cu₂S-Ni₃S₂ system at 1423 K.