Investigation of the Chemical Interaction in the Sb2Te3–InSe System and the Properties of the Obtained Phases

The interaction in the Sb 2 Te 3 –InSe system was studied and the T–x phase diagram was constructed by integrated methods of physicochemical analysis (differential thermal, X-ray powder diffraction, and microstructural analyses) and also by microhardness and density measurements. It was found that the Sb 2 Se 3 –InSe system is a quasi-binary section of the ternary reciprocal system Sb,In||Se,Te. In the Sb 2 Te 3 –InSe system, compounds InSb 2 SeTe 3 and In 3 Sb 2 Se 3 Te 3 form, which incongruently melt at 525 and 600°C, respectively. It was found that the regions of solid solutions based on Sb 2 Te 3 and InSe extend to 3 and 2 mol %, respectively. The compounds Sb 2 Se 3 and InSe form a eutectic with the coordinates 20 mol % InSe and 510°C. The temperature dependences of the electrical conductivity and thermal emf of the solid solutions (Sb 2 Te 3 ) 1 – x (InSe) x ( x = 0.01, 0.02, and 0.03).