Système pseudo-ternaire Ag2S-Ga2S3-GeS2: Diagramme de phases—Domaine vitreux

The phase diagram of the Ag2S-Ga2S3-GeS2 pseudo-ternary system has been studied using DTA and XRD experiments. Only one quaternary compound was observed: AgGaGeS4, which presents a binary peritectic-type decomposition at 840°C. Four ternary invariants were found: two eutectics and two peritectics. The phase diagrams of the following systems are described: Ag2S-Ga2S3, AgGaS2-GaS2, Ga2S3-AgGaGeS4, AgGaGeS4-Ag8GeS6, and Ag9GaS6-Ag8GeS6. The system shows a large-sized glassy domain resulting from glasses of the GeS2-Ga2S3 and GeS2-Ag2S binary systems, which does not reach the Ga2S3-Ag2S quasi binary system. Glass transition Tg and crystallization Tc temperatures decreased as silver content increased.