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

doi:10.1016/j.matchemphys.2013.05.072

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

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

17 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, Ag_1.9Te, 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 language	English (US)
Pages (from-to)	758-767
Number of pages	10
Journal	Materials Chemistry and Physics
Volume	141
Issue number	2-3
DOIs	https://doi.org/10.1016/j.matchemphys.2013.05.072
State	Published - Sep 16 2013

Funding

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.

Keywords

Computer modeling and simulation
Microstructure
Solidification
Thermoelectric effects

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics

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10.1016/j.matchemphys.2013.05.072

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title = "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-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.",

keywords = "Computer modeling and simulation, Microstructure, Solidification, Thermoelectric effects",

author = "Wu, {Hsin Jay} and Foo, {Wei Jian} and Wojciech Gierlotka and Chen, {Sinn Wen} and Snyder, {G. Jeffrey}",

note = "Funding Information: 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. ",

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AU - Wu, Hsin Jay

AU - Foo, Wei Jian

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AU - Chen, Sinn Wen

AU - Snyder, G. Jeffrey

N1 - Funding Information: 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.

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N2 - 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.

AB - 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.

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KW - Solidification

KW - Thermoelectric effects

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

Abstract

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