The phase equilibria in the FeSe–FeGa₂Se₄–FeIn₂Se₄ system were studied using the differential thermal analysis (DTA) and x-ray diffraction (XRD) methods. An isothermal section at 700 K, some isopleths sections of the phase diagram, and the projection of the liquidus surface were constructed. The results show that the 2FeSe–FeGaInSe₄ section is quasibinary and of eutectic type. The crystal structure of FeGaInSe₄ was refined by the Rietveld method, revealing that this compound cannot be regarded as an ordinary substitutional solid solution but as an ordered phase that differs qualitatively from FeIn₂Se₄ in the occupancy of crystallographic positions.

Phase Relations in the FeSe–FeGa₂Se₄–FeIn₂Se₄ System: Refinement of the Crystal Structures of FeIn₂Se₄ and FeGaInSe₄. Faik Mammadagha Mammadov, Imamaddin Rajabali Amiraslanov, Samira Zakir Imamaliyeva & Mahammad Baba Babanly. ISSN: 1547-7037 (Print) 1863-7345 (Online).