About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Alloys and Compounds for Thermoelectric and Solar Cell Applications X
|
Presentation Title |
Relationship between Lattice-site Preference and Phase Stability in Thermoelectric Compounds Mg2M (M: Si, Ge, Sn) and RNiSn (R: Ti, Zr, Hf) |
Author(s) |
Yoshisato Kimura, Yaw Wang Chai, Manabu Watanabe, Yonghoon Lee |
On-Site Speaker (Planned) |
Yoshisato Kimura |
Abstract Scope |
We focus on the Anti-Fluorite (AF) Mg2(Si,Ge,Sn) and Half-Heusler (HH) (Ti,Zr, Hf)NiSn systems, in which solid solution formation and related two-phase separation can be considered as important factors to control and enhance thermoelectric performance. The objective is to understand the relationship between site-preference of solute atoms at specific lattice-site and phase stability based on phase equilibria for both systems. Two-phase separation from random solid solution occurs between Mg2(Si,Ge) and Mg2Sn, and between TiNiSn and (Zr,Hf)NiSn, according to large lattice misfits as the dominant cause in common. In the case of AF, the partitioning of doping elements was traced through the phase separation, which affects thermoelectric performance. In the case of HH, the specific site occupation is the key to control conduction type between N and P, which is related to the substitution for the Ni-site as well as the vacancy-site occupation with proper solute atoms. |
Proceedings Inclusion? |
Planned: |
Keywords |
Electronic Materials, Energy Conversion and Storage, |