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

The interaction in the Sb2Te3-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 Sb2Se3-InSe system is a quasi-binary section of the ternary reciprocal system Sb,In||Se,Te. In the Sb2Te3-InSe system, compounds InSb2SeTe3 and In3Sb2Se3Te3 form, which incongruently melt at 525 and 600 degrees C, respectively. It was found that the regions of solid solutions based on Sb2Te3 and InSe extend to 3 and 2 mol %, respectively. The compounds Sb2Se3 and InSe form a eutectic with the coordinates 20 mol % InSe and 510 degrees C. The temperature dependences of the electrical conductivity and thermal emf of the solid solutions (Sb2Te3)(1 - x)(InSe)(x) (x = 0.01, 0.02, and 0.03).