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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Alloys and Compounds for Thermoelectric and Solar Cell Applications VIII
Presentation Title Gradient Composition Layered Microstructure Development in Thermoelectric Mg2(Si,Sn) Alloys Based on Phase Equilibrium
Author(s) Yoshisato Kimura, Narumi Sakamoto, Zhifang Zhou, Yaw Wang Chai, Yu Ikuta, Yonghoon Lee
On-Site Speaker (Planned) Yoshisato Kimura
Abstract Scope Thermoelectric properties are sensitively affected by microstructure which changes during high temperature fabrication processes and practical long term operation. We focused on microstructure development in the Mg2Si–Mg2Sn pseudo-binary system. It is governed by phase equilibrium while being affected by kinetic factors such as diffusion rate, and so forth. The objectives of the present work are to characterize gradient composition layered microstructure, and to evaluate its effect on thermoelectric properties. We determined the Mg–Si–Sn ternary phase diagram focusing on the solidification route regarding the Mg2Si–Mg2Sn pseudo-binary system. It has been found that Mg2(Si,Sn) alloys have gradient composition layered microstructure which is basically formed according to the peritectic reaction, Mg2Sn is synthesized from liquid phase and Mg2Si, under the influence of the rate controlling due to diffusion and nucleation. The lattice thermal conductivity can effectively be reduced by phase interfaces of gradient composition layered microstructure.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

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Defect Formation Energies and Effective Masses in the Mg2(Si,Sn) Solid Solutions via DFT Calculations
Enhanced Averaged zT in n-type Bi2Te3 via Solubility Control
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