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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Alloys and Compounds for Thermoelectric and Solar Cell Applications IX
Presentation Title Phase Interface Formation Induced by Phase Separation Process in Thermoelectric Mg2(Si, Sn) Alloys and (Zr, Ti)NiSn Alloys
Author(s) Yoshisato Kimura, Yaw Wang Chai, Manabu Watanabe, Yonghoon Lee
On-Site Speaker (Planned) Yoshisato Kimura
Abstract Scope Formation of solid solution of a compound phase is very effective to reduce the lattice thermal conductivity. In the case that a solid solution phase is formed having compositional difference (gradient) of solute atoms, phase separation with interface formation is induced in order to release the elastic energy due to a lattice misfit. As the objective of the present work, we focused on the formation mechanism of phase separation induced interfaces, and microstructure control based on phase separation process. We have observed and analyzed phase interfaces which are formed due to the phase separation in two alloy systems, one between Mg2Si–Mg2Sn phases during solidification process and the other between ZrNiSn–TiNiSn phases during heat treatments. We have determined the formation of sharp interfaces in the former alloys and quite diffuse interfaces in the latter alloys. The lattice thermal conduction can effectively be reduced in both alloys.
Proceedings Inclusion? Planned:
Keywords Electronic Materials, Energy Conversion and Storage, Other

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Effect of Interfacial Reaction on Bi2Te3 and Sb2Te3 Thin-film Thermoelectric Module
Effect of Phonon Drag on Seebeck Coefficient Based on Linear Response Theory
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First-principles Calculation of Nernst Coefficient and Magneto-Seebeck
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High-performance GeTe-based Thermoelectric Materials via Carrier Optimization
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Interfacial Reaction in Ag/Se, Ag/Te, Ag2Te/Se and Ag2Te/Se-30at.%Te Couples and Their Related Phase Diagram
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Mg3(Sb,Bi)2 Thermoelectric Single Crystals: From p-type to n-type
Microstructure and Band Engineering for the High Performance of n-type Mg3Sb2-Mg3Bi2 Alloy
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Ni/Pb-Te and Ni/Se-Sn Interfacial Reactions and Their Related Phase Diagrams
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Phase Boundary Mapping to Improve Na solubility, Band Convergence, and Thermoelectric Properties in p-type PbTe
Phase Interface Formation Induced by Phase Separation Process in Thermoelectric Mg2(Si, Sn) Alloys and (Zr, Ti)NiSn Alloys
Phase Transition Behavior and Thermoelectric Property of Te doped Cu2Se
Self-tuning of Carrier Type and Improved Thermoelectric Performance in Skutterudite CoM1.5Te1.5 (M = Sn or Ge)
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Strategies for the Balance of Oxide/Metal Composites Towards the Applications of Flexible Solar Energy Harvesters
Structure and Physical Properties of Complex Chalcogenides: Fundamental Research with an “Eye” Towards Lower Temperature Applications
The Doping Effects on the Thermal Conductivity of GeTe
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The “Grand Challenge” of Thermoelectric Materials
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Thermomagnetic Properties of Single-crystal 2H-NbSe2 and Bi2Te3
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