|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications VI
||K-6: Determination of the Mg-Si-Sn Ternary Phase Diagram to Evaluate Phase Stability of Thermoelectric Mg2(Si,Sn) Compound
||Natsumi Kaneko, Yosuke Kubo, Yoshisato Kimura, Yong-Hoon Lee, Hiroyuki Matsunami, Hirokuni Hachiuma
|On-Site Speaker (Planned)
Mg2(Si,Sn) is an ecofriendly thermoelectric material having high potential, however, alloy compositions would shift to lower Mg concentration because of sublimation and oxidation of Mg during fabrication processes and applications at high temperatures. We need to understand phase equilibrium in the Mg-Si-Sn ternary system since microstructure change induced by compositional shift affects thermoelectric properties. The objective of this work is to evaluate the Mg-Si-Sn ternary phase diagram including the Mg2Si-Mg2Sn pseudo-binary as the basis of thermoelectric materials design on Mg2(Si,Sn). We theoretically estimated possible reaction schemes based on subset binary systems. Microstructure observation, quantitative chemical analysis, and differential thermal analysis were conducted for as-solidified and annealed alloys to evaluate the reaction scheme and several isotherms. Monovariant lines from the peritectic point of the Mg2Si-Mg2Sn pseudo-binary are connected to ternary invariant reactions; one on the Mg-rich side and the other on the Sn-rich side in the Mg-Si-Sn ternary system.
||Planned: Supplemental Proceedings volume