Based on the results of the DTA and X-ray phase analysis, the phase equilibria in the BiTeI–BiSI system were studied and the T–x phase diagram was constructed. It was established that the system is stable in the subsolidus area and there are ~7–8 mol %  and ~5 mol%  solid solution areas based on  BiTeI and BiSI compounds at room temperature, accordingly. In2016 general, the system is non-quasibinary. Bi₁₉ S₂₇I₃ (0–33 mol % BiTeI ) and tetradymite-Bi₂Te₂ S (33–83mol% BiTeI ) phases primarily crystallize from the liquid phase in the wide composition ranges

doi.org/10.32737/0005-2531-2020-1-36-40