Liquidus projection and isothermal section of Sb-Se-Te ternary system

• Published in: Materials chemistry and physics 2017-11, Vol.201, p.391-398
• Main Authors: Chen, Sinn-wen, Chang, Jui-shen, Chang, Liang-chun
• Format: Article
• Language: English
• Subjects: Alloy systems; Alloys; Computer memory; Diagrams; Isothermal section; Liquidus; Liquidus projection; Miscibility; Miscibility gap; Phase diagram; Phase transitions; Sb-Se-Te; Solidification; Ternary systems; Triangles
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2017.08.043

Sb-Se-Te alloys have great application potential for infrared, phase memory change, thermoelectric and solar cell devices. The liquidus projection and 400 °C isothermal section of Sb-Se-Te ternary system are experimentally determined. No ternary compound is found. There is a miscibility gap along the Sb-Se side, and there are six primary solidification phase regions, (Sb), δ-(Sb2Te), γ-(SbTe), Sb2Te3, (Se,Te) and Sb2Se3. There are four invariant reactions involving the liquid phase. The reactions with the lowest and highest reaction temperatures are L + Sb2Te3↔Sb2Se3+(Se,Te) at 415±1 °C and L+(Sb)↔δ-(Sb2Te)+Sb2Se3 at 515°±1C, respectively. In the 400 °C Sb-Se-Te isothermal section, there are five tie-triangles, which are Sb2Se3+δ-(Sb2Te)+(Sb), Sb2Se3+δ-(Sb2Te)+γ-(SbTe), Sb2Se3+γ-(SbTe)+Sb2Te3, Sb2Se3+Sb2Te3+(Se,Te), and Sb2Se3+Liquid+(Se,Te). [Display omitted] •The liquidus projection of Sb-Se-Te system is determined.•Six primary solidification phases: Sb, (Se,Te), Sb2Te, SbTe, Sb2Te3, and Sb2Se3.•The 400 °C isothermal section of Sb-Se-Te system is determined.•No ternary compound is found in the Sb-Se-Te ternary system.