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