Alloys of the As2Se3-NdSe system were synthesized in a wide range of concentrations. The As2Se3-NdSe system was studied by differential thermal (DTA), X-ray diffraction (XRD), microstructural (MSA) analysis, as well as by measuring microhardness and density. The system has small single-phase fields based on primary components. In the As2Se3-NdSe system, the area of the solid solution based on the As2Se3 compound at room temperature is 1.5 mol. %, and the area of the solid solution based on the NdSe compound is 2.0 mol. %. Upon slow cooling in the As2Se3-NdSe system based on As2Se3, the glass formation region reaches 17 mol % NdSe. The photo- and electrical conductivity of glassy alloys of the As2Se3-NdSe system containing (As3Se3)1-x(NdSe)x (x = 0.03; 0.05; 0.07; 0.10) has been studied

Phase equilibrium and glass formation between AsS and ErS compounds were studied by methods of physicochemical analysis: differential-thermal (DTA), X-ray phase (XRD), microstructural analysis (MSA), as well as by measuring microhardness and density. The T-x phase diagram of the AsS–ErS system was constructed. It has been established that the phase diagram of the AsS–ErS system is quasi-binary, of the eutectic type and is characterized by the formation of the chemical compound ErAsS2. The ErAsS2 compound is formed as a result of the peritectic reaction M+ErS↔ ErAsS2 at 7500C and crystallizes in the tetragonal syngony with lattice parameters: a=13.62; c=18.93 Ǻ; ρpuc= 5.17 g/cm3, ρX-ray= 5.21 g/cm3. The eutectic composition between the AsS and ErS compounds is 10 mol % ErS and a temperature of 280oC. Under normal cooling conditions, the area of glass formation based on AsS reaches 10 mol % ErS. For glass alloys, some physicochemical properties have been studied. Solubility based on AsS reaches up to 1.5 mol % ErS, and based on ErS, the solubility is practically not established