Microstructure and thermoelectrical investigations of an N-type magnesium-silicon-tin alloy

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• 作者：Radivoje Vracar ; Guillaume Bernard-Granger ; ^{guillaume.bernard-granger@cea.fr" class="auth_mail} ; Christelle Navone ; Mathieu Soulier ; Mathieu Boidot ; Jean Leforestier ; Julia Simon
• 关键词：Thermoelectric materials ; Spark plasma sintering ; Transmission electron microscopy
• 刊名：Journal of Alloys and Compounds
• 出版年：15 June, 2014
• 年：2014
• 卷：598
• 期：Complete
• 页码：272-277
• 全文大小：2552 K

文摘

An N-type Mg₂Si_0.3875Sn_0.6Sb_0.0125 powder, directly prepared by mechanical alloying from the raw elements, has been sintered by spark plasma sintering. TEM observations enabled to detect nano-sized inclusions (diameter around 13 nm, 1.9 脳 10⁹ inclusions/mm²) dispersed in the bulk of individual grains constituting the sintered polycrystal (grain size around 450 nm). These inclusions (enriched in Sn and impoverished in Mg) are thought to scatter lattice vibrations, leading to a dimensionless-thermoelectrical figure of merit (ZT) around 0.85 at 500 掳C.