Abstract
The solubility of YbTe in Sb2Te3 is investigated by a combination of DTA, XRD, SEM, and EMF methods. The fragment of the T-x phase diagram of the YbTe-Sb2Te3 system is constructed for 0-25 mol.% YbTe. It is shown that the solubility limit for YbTe in Sb2Te3 is achieved at 15 mol.% YbTe at 300 K and at 17.5 mol.% YbTe at 855 K. From the EMF measurements with an YbTe electrode the partial thermodynamic functions of the YbTe pseudo-component are calculated for the alloys of different compositions. Also, the standard integral thermodynamic functions of the YbTe dissolution in Sb2Te3 as well as the standard thermodynamic functions of formation and the standard entropy of the solid solution are calculated from the experimental data.