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Published September 16, 2013 | public
Journal Article

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

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-Ag_2Te, β-Ag_2Te, Ag_(1.9)Te, Ag_5Te_3, Te, PbTe and Pb, including a miscibility gap extended from the Ag–Te side. A ternary-eutectic reaction, L = PbTe + Te + Ag_5Te_3, 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 Ag_5Te_3 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.

Additional Information

© 2013 Elsevier B.V. Received 25 November 2012. Received in revised form 25 April 2013. Accepted 27 May 2013. The authors acknowledge the financial support of National Science Council of Taiwan (NSC 99-2221-E-007-093-MY3, 100-2221-E-155-019, 101-3113-P-008-001 and Grant 100-2917-I-007-001) and of the Air Force Office of Scientific Research (AFOSR MURI FA9550-10-1-0533) of USA.

Additional details

Created:
August 22, 2023
Modified:
October 24, 2023