Thermodynamic properties of solid solutions in the Ag2S – Ag2Se1 system. IntroductionThis article is about the calculation of the standard thermodynamic properties of the four solid solutions in the phase diagram of Ag2S - Ag2Se. They calculated these properties using the model of regular and subregular solutions. The four solid solutions are: a restricted fcc solid solution (γ- Ag2S-Ag2S1-xSe (x