ISSN 0005-2531 (Print) ISSN 2522-1841 (Online)
T.M.Ilyasly, D.T.Hasanova, I.I.Aliyev

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

Keywords : phase, glass formation, microhardness, liquidus, syngony
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