Phase equilibria in the Ag2Te-PbTe-Sb2Te3 system and thermodynamic properties of the (2PbTe)1-x(AgSbTe2)x solid solutions

Mashadiyeva L. F., Mansimova S. H., Babanly D. M., Yusibov Y. A., Tagiyev D. B., Babanlı M.

Acta Chimica Slovenica, vol.67, no.3, pp.799-811, 2020 (SCI-Expanded, Scopus) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 67 Issue: 3
  • Publication Date: 2020
  • Doi Number: 10.17344/acsi.2019.5748
  • Journal Name: Acta Chimica Slovenica
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Central & Eastern European Academic Source (CEEAS), Chemical Abstracts Core, EMBASE, MEDLINE, Directory of Open Access Journals, DIALNET
  • Page Numbers: pp.799-811
  • Keywords: Ag-Sb-Pb-Te system, Antimony telluride, Lead telluride, Phase equilibria, Silver telluride, Solid solution, Thermodynamic functions
  • Open Archive Collection: Article
  • Azerbaijan State University of Economics (UNEC) Affiliated: Yes

Abstract

Phase equilibria in the Ag2Te-PbTe-Sb2Te3 system were experimentally investigated by means of differential thermal analysis, powder X-ray diffraction techniques and electromotive force (EMF) measurement method. A liquidus surface projection of the system, 750 K and 300 K isothermal sections, as well as five vertical sections of the phase diagram, were constructed. The primary crystallization fields of phases and homogeneity range of phases were also determined. The character and temperature of the various nonvariant and monovariant equilibria were identified. The studied system is characterized by the formation of a wide continuous band of a high-temperature cubic structured solid solution (β-phase) between PbTe and Ag1-xSb1 + xTe2 + x intermediate phase. The partial molar thermodynamic functions of lead telluride in alloys and standard integral thermodynamic functions of the β-solid solutions along the 2PbTe-”AgSbTe2” section were calculated based on the EMF measurements results.