THERMODYNAMIC PROPERTIES OF Pb6Sb6Se17

Shabnam Hamlet Mansimova; Elnur Najaf Orujlu; Samina Geys Sultanova; Mahammad Baba Babanly

doi:10.17308/kcmf.2017.19/234

Authors

Shabnam Hamlet Mansimova PhD student of Baku State University; ph.: (+994) 502296446
Elnur Najaf Orujlu magistrate of Institute of Catalysis and Inorganic Chemistry Azerbaijan National Academy of Sciences
Samina Geys Sultanova PhD student of Baku State University; ph.: (+994) 556002213
Mahammad Baba Babanly Dr. Sci. (Chem.), Deputy Director of Institute of Catalysis and Inorganic Chemistry Azerbaijan National Academy of Sciences; ph.: (+995) 518378621, e-mail: babanlymb@gmail.com

DOI:

https://doi.org/10.17308/kcmf.2017.19/234

Keywords:

lead-antimony selenides, Pb6Sb6Se17, EMF method, thermodynamic properties

Abstract

The Pb-Sb-Se system was investigated in the PbSe-Pb₆Sb₆Se₁₇-Sb₂Se₃-Se composition area and temperature range 300–450 K using EMF measurements on reversible concentration cells of the type

(–) PbSe(s) | liquid electrolyte, Pb²⁺ | (Pb–Sb–Se)(s)(+).

It was shown that this subsystem consists of two three-phase regions, limited by the Pb₆Sb₆Se₁₇-Sе tie-line. Partial thermodynamic functions of PbSe and lead in tree-phase Pb₆Sb₆Se₁₇–Sb₂Se₃–Se region are calculated from the equations for the EMF temperature dependences. The standard Gibbs energy of formation, standard enthalpy of formation and standard entropy of the Pb₆Sb₆Se₁₇ compound were calculated based these data and using the thermodynamic functions for PbSe and Sb₂Se₃.

ACKNOWLEDGMENT

The work has been carried out within the framework of the international joint research laboratory “Advanced Materials for Spintronics and Quantum Computing” (AMSQC) established between Institute of Catalysis and Inorganic Chemistry of ANAS (Azerbaijan) and Donostia International Physics Center (Basque Country, Spain).