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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Alloys and Compounds for Thermoelectric and Solar Cell Applications VIII
Presentation Title Heat Stability of Mg2Si1-xSnx as Affected by Heat Treatment Temperature and Duration
Author(s) Mahdi Mejri, Yohann Thimont, Benoit Malard, Claude Estournes
On-Site Speaker (Planned) Mahdi Mejri
Abstract Scope A thermoelectric generator is a static and autonomous system that converts thermal energy into electrical energy and vice-versa. Degenerated semiconductors, including Mg2Si1-xSnx belong to the family of the most promising thermoelectric materials for medium temperature applications. Fully dense Mg2Si1-xSnx based materials have been elaborated using spark plasma sintering process. After sintering, due to the short time process, they present heterogeneities of composition. In order to stabilize them, heat treatments were carried out at different temperatures and holding times. Annealing at 750C for 3 hours, the material remains biphasic with the presence of a Si rich phase (x→0.1) distributed in a matrix Sn rich one (x→0.6). Porosities were evidence due to Sn diffusion leading to Kirkendall effect. A swelling of the material was observed due to the change in composition and porosities creation. The microstructure and properties of the different materials will be discussed.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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