Quasi-Ternary System Cu2Se-GeSe2-As2Se3

• Published in: Journal of phase equilibria and diffusion 2020-04, Vol.41 (2), p.157-163
• Main Authors: Klymovych, O., Ivashchenko, I., Olekseyuk, I., Zmiy, O., Lavrynyuk, Z.
• Format: Article
• Language: English
• Subjects: Arsenic triselenide; Ceramics; Composites; Copper selenides; Crystallization; Crystallography and Scattering Methods; Differential thermal analysis; Engineering Thermodynamics; Glass; Heat and Mass Transfer; Liquidus; Metallic Materials; Natural Materials; Phase diagrams; Physics; Physics and Astronomy; Ternary systems; Thermodynamics
• ISSN: 1547-7037; 1863-7345; 1934-7243
• DOI: 10.1007/s11669-020-00796-3

Direct single-temperature method has been employed to synthesize 137 samples of the Cu 2 Se-GeSe 2 -As 2 Se 3 system. The samples have been investigated by x-ray diffraction and differential thermal analysis. The isothermal section at 513 K (240  °C), two phase diagrams GeSe 2 -As 2 Se 3 and Cu 2 GeSe 3 -As 2 Se 3 , four vertical sections Cu 2 GeSe 3 -CuAsSe 2 , Cu 8 GeSe 6 -CuAsSe 2 , Cu 8 GeSe 6 -As 2 Se 3 , A - B ( A  = 85 mol.% GeSe 2 -15 mol.% Cu 2 Se; B  = 85 mol.% As 2 Se 3 -15 mol.% Cu 2 Se), and the liquidus surface projection onto the concentration triangle have been constructed. The existence of the ternary compounds Cu 2 GeSe 3 , Cu 8 GeSe 6 and CuAsSe 2 have been confirmed. The fields of the primary crystallization of phases, character, temperatures and coordinates of nonvariant points have been determined.