The Ag₂S–Ga₂S₃–As₂S₃ system

Chem. Met. Alloys 8 (2015) 22-26

https://doi.org/10.30970/cma8.0299

T.L. KLYMUK, I.D. OLEKSEYUK, I.I. MAZURETS’

The Ag₂S–Ga₂S₃–As₂S₃ system was investigated by differential thermal and X-ray diffraction. The phase diagrams of the systems Ag₂S–As₂S₃, Ag₉GaS₆–Ag₃AsS₃, AgGaS₂–AgAsS₂, and AgGaS₂–Ag₃AsS₃ were constructed, as well as the liquidus surface projection and the isothermal section at 500 K. The interaction in the Ag₂S–As₂S₃ system is eutectic and is described by the equations L_e1 ↔ Ag₂S + Ag₃AsS₃ (e₁: 25 mol.% As₂S₃, 720 K), L_e2 ↔ AgAsS₂ + Ag₃AsS₃ (e₂: 40 mol.% As₂S₃, 650 K), and L_e3 ↔ AgAsS₂ + As₂S₃ (e₃: >99 mol.% As₂S₃, 580 K). The eutectic point in the AgGaS₂–AgAsS₂ system lies at 94 mol.% AgAsS₂, 653 K. The coordinates of the eutectic in the AgGaS₂–Ag₃AsS₃ system are 92 mol.% Ag₃AsS₃, 670 K, and in the Ag₉GaS₆–Ag₃AsS₃ system the eutectic lies at 90 mol.% Ag₃AsS₃, 687 K.

Isothermal section of the Ag₂S–Ga₂S₃–As₂S₃ system at 500 K.

Keywords

Phase diagram / Isothermal section / Liquidus surface projection