Polyhedration of the Pb–S–Se–Te system

Chem. Met. Alloys 10 (2017) 120-125

https://doi.org/10.30970/cma10.0366

Michal FILEP, Marjan SABOV

Polyhedration of the quaternary Pb–S–Se–Te system was carried out. Three new quasi-binary systems: Se–PbS, Te–PbS and Te–PbSe, and two quasi-ternary systems: PbS–PbSe–Te and PbS–Se–Te, were established. The phase equilibria in the Se–PbS, Te–PbS, and Te–PbSe quasi-binary systems were investigated by DTA, XRD and MSA. The systems belong to the eutectic type, the coordinates of the invariant eutectic points being 5 mol.% PbS, 402 K (Se–PbS), 3 mol.% PbS, 697 K (Te–PbS) and 3 mol.% PbSe, 688 K (Te–PbSe). The corresponding T-x phase diagrams were built. The quaternary system Pb–S–Se–Te is divided by the PbS–PbSe–PbTe, PbS–PbSe–Te, and PbS–Se–Te quasi-ternary systems into four secondary subsystems: Pb–PbS–PbSe–PbTe, Te–PbS–PbSe–PbTe, PbS–PbSe–Se–Te, and PbS–S–Se–Te.

Quasi-ternary and secondary quaternary systems in the Pb–S–Se–Te system.

Keywords

Lead chalcogenides / Quaternary system / Polyhedration / Phase diagram