Compound InAs₂S₂Se₂ was found during studying the system  InAs₂S₃Se–InAs₂Se₃S. It was established that the compound InAs₂S₂Se₂ melts congruently at 615 K. crystallizes in tetragonal syngony with lattice parameters: а=9.22±0.01, с=5.81±0.002 Å; Z=3. Coordinates of eutectic points: 40 mol % InAs₂Se₃S, Т=548 K and 60 mol % InAs₂Se₃S, Т=580 K. Narrow solid solution ranges are formed on the basis of primary components. Solid solutions based on InAs₂S₃Se at room temperature reach up to 5 mol  %, but on the basis of InAs₂Se₃S – up to10 mol %

https://doi.org/10.32737/0005-2531-2019-2-44-47