Thermodynamics of FeS-PbS-In2S3 and Properties of Intermediate Phases

Abstract

The thermodynamic analysis and the X-ray Phase Analysis (XPA) of the FeS–PbS–In2S3system were carried out. It is shown that along with the triple phases of MIn2S4(M – Fe, Pb) and Pb6In6S21, the Fe1.5Pb5.5In10S22phase also participates in the triangulation of the system. The standard thermodynamic functions for the formation of MIn2S4(M-Fe, Pb), Pb6In6S21and Fe1.5Pb5.5In10S22are estimated. An isothermal section of the FeS–PbS–In2S3system at 298 K is constructed. It is shown that the activation energy of the impurity level located in the band gap of Fe1.5Pb5.5In10S22is equal to 0.19 eV.