Liquidus projection of the Ag-Sn-Te ternary system
Journal
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Journal Volume
45
Journal Issue
9
Start Page
3728
End Page
3740
ISSN
10735623
Date Issued
2014
Author(s)
Abstract
The Ag-Sn-Te ternary system is of interest to thermoelectric applications and its liquidus projection is determined in this study. Forty Ag-Sn-Te ternary alloys are prepared and their primary solidification phases are determined. These different primary solidification phase regions include three terminal solid solutions: Ag, Sn, and Te; six binary intermediate phases: SnTe, β-Ag5Te3, Ag1.9Te, Ag2Te (assuming no phase transformation), ζ-Ag4Sn, and ε-Ag 3Sn; and one ternary compound, AgSnTe2. These data, together with the phase diagrams of the three constituent binary systems, are employed to construct the univariant lines of the liquidus projection. The temperature-descending directions of these univariant lines are determined using thermal analysis results and mass balance concept. The types of invariant reactions and the reaction temperatures are determined from the temperature-descending directions of the univariant lines and by thermal analysis. There are two Class I reactions, five Class II reactions, and one Class III reaction. The invariant reaction with the highest reaction temperature is L + Ag = Ag2Te + ε-Ag3Sn, at 992.7 ± 4K (719.5 ± 4 °C), and that with the lowest reaction temperature is L = Sn + ε-Ag3Sn + SnTe, at 494.2 ± 4K (221 ± 2 °C). © The Minerals, Metals & Materials Society and ASM International 2014.
SDGs
Publisher
Springer Boston
Type
journal article