The microstructure, liquidus projection and thermodynamic modeling of thermoelectric Ag-Pb-Te system

Hsin-Jay Wu, Wei Jian Foo, Wojciech Gierlotka, Sinn Wen Chen*, G. Jeffrey Snyder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Ag-Pb-Te is an important system in thermoelectric applications. Various Ag-Pb-Te alloys are prepared and their microstructures are examined. The liquidus projection of ternary Ag-Pb-Te system is determined both by experimental investigations and Calphad calculations, and the results are in good agreement. There are eight primary solidification phases, Ag, γ-Ag2Te, β-Ag2Te, Ag1.9Te, Ag 5Te3, Te, PbTe and Pb, including a miscibility gap extended from the Ag-Te side. A ternary-eutectic reaction, L = PbTe + Te + Ag5Te3, was determined with a liquid composition of Ag-4.3at%Pb-62.6at%Te at 337 C. A nanoscale microstructure containing a dotted PbTe and a lamellar matrix of Ag5Te3 and Te phases results from the ternary eutectic reaction. The solidification paths of selective ternary Ag-Pb-Te alloys are calculated using the Scheil model with the optimized interaction parameters obtained in this study, and the results are consistent with the experimental observations.

Original languageEnglish
Pages (from-to)758-767
Number of pages10
JournalMaterials Chemistry and Physics
Volume141
Issue number2-3
DOIs
StatePublished - 16 Sep 2013

Keywords

  • Computer modeling and simulation
  • Microstructure
  • Solidification
  • Thermoelectric effects

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