Investigation of the MnIn₂S₄-AgIn₅S₈ system

The single crystals of ternary compounds MnIn2S4, AgIn5S8 and solid solutions on their basis have been obtained for the first time employing Bridgeman method. The single crystals' compositions and structure were determined. It is seen that the pointed compounds MnIn2S4, AgIn5S8 and their solid solutions are crystallized in the spinel cubic structure. The elementary cell parameters which were calculated with the method of the least squares change linearly, i.e. in the system MnIn2S4, AgIn5S8. MnIn2S4, AgIn5S8 compounds and MnIn2S4-AgIn5S8 solid solutions density were determined using pictinometric - Knupp method. The density with composition changes linearly. The microdensity changes with the maximum for composition х = 0.20. The temperatures of the phase transformations of the pointed solutions were determined with the DTA method and the system AgIn5S8-MnIn2S4 state diagram was built. The system is characterized by the slight interval of the concentration and, which allows to attribute it to the state diagram of the first type according to the Rosebom classification