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The quasi-binary section AgGaS2–PbS in the ternary system Ag2S–Ga2S3–PbS was studied by physicochemical analysis methods (differential thermal, X-ray powder diffraction, and metallographic analyses). The state diagram of the system was constructed, and the quaternary compound AgPb2GaS4 was detected to form by a peritectic reaction at 1225 K. Its formation conditions were identified, and its physicochemical...