TY - JOUR
T1 - The microstructure, liquidus projection and thermodynamic modeling of thermoelectric Ag-Pb-Te system
AU - Wu, Hsin Jay
AU - Foo, Wei Jian
AU - Gierlotka, Wojciech
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.
PY - 2013/9/16
Y1 - 2013/9/16
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.
KW - Computer modeling and simulation
KW - Microstructure
KW - Solidification
KW - Thermoelectric effects
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U2 - 10.1016/j.matchemphys.2013.05.072
DO - 10.1016/j.matchemphys.2013.05.072
M3 - Article
AN - SCOPUS:84881138689
VL - 141
SP - 758
EP - 767
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
SN - 0254-0584
IS - 2-3
ER -