Synthesis and Study of the Properties of the Compounds beta -In2S3, AgIn5S8 and CuIn5S8.

Large-block crystals of the compounds beta -In//2S//3, AgIn//5S//8 and CuIn//5S//8 have been grown by the method of two-temperature synthesis, while single crystals of these compounds have been grown from the gas phase. The lattice periods, the microhardness and the forbidden band width of the crystals were determined, and the IR transmission and reflection spectra of these compounds were recorded in the 100-450 cm** minus **1 range.