Abstract
The phase equilibria in the FeS-FeGa2S4-FeGaInS4 system were studied using the differential thermal and X-ray diffraction phase analysis. The projection of the liquidus surface and the isothermal sections of the phase diagram at 1200 and 900 K were constructed. It revealed that it belongs to quasi- ternary systems with monovariant eutectic and peritectoid equilibria. At 1200 K, the system was characterized by the presence of a continuous series of solid solutions along the boundary system FeGa2S4- FeGaInS4 (β-phase) as well as solid solutions based on the high-temperature modification FeS (α-phase) which formed a wide two-phase region α + β. The FeS-FeGa2S4 boundary system was characterized by the formation of the Fe2Ga2S5 ternary compound at 900 K. This compound formed Fe2Ga2S5+β and Fe2Ga2S5+ α+β heterogeneous regions below this temperature which significantly narrowed the two-phase region α + β.