Effect of nanocomposite structure on the thermoelectric properties of 0.7-at% Bi-doped Mg2Si nanocomposite

Nanocomposites offer a promising approach to the incorporation of nanostructured constituents into bulk thermo- electric materials. The 0.7-at% Bi-doped Mg2Si nanocomposites are prepared by spark plasma sintering of the mixture of nanoscale and microsized 0.7-at% Bi-doped Mg2Si powders. Microstructu...

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Published in:Chinese physics B 2011-10, Vol.20 (10), p.355-361
Main Authors: Yang, Mei-Jun (梅君 杨), Shen, Qiang (强沈), Zhang, Lian-Meng (联盟 张)
Format: Article
Language:English
Subjects:
Intermetallics
Magnesium compounds
Mg2Si
Nanocomposites
Nanomaterials
Nanostructure
Seebeck系数
Semiconductors
Silicides
Thermoelectricity
双掺杂
复合材料结构
微观结构分析
放电等离子烧结
热电性能
纳米复合材料
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container_end_page 361
container_issue 10
container_start_page 355
container_title Chinese physics B
container_volume 20
creator Yang, Mei-Jun (梅君 杨)
Shen, Qiang (强沈)
Zhang, Lian-Meng (联盟 张)
description Nanocomposites offer a promising approach to the incorporation of nanostructured constituents into bulk thermo- electric materials. The 0.7-at% Bi-doped Mg2Si nanocomposites are prepared by spark plasma sintering of the mixture of nanoscale and microsized 0.7-at% Bi-doped Mg2Si powders. Microstructure analysis shows that the bulk material is composed of nano- and micrograins. Although the nanograin hinders electrical conduction, the nanocomposite struc- ture is more helpful to reduce thermal conductivity and increase the Seebeck coefficient, hence improving thermoelectric performance. A dimensionless figure of merit of 0.8 is obtained for the 0.7-at% Bi-doped Mg2Si nanocomposite with 50-wt % nanopowder, which is about twice larger than that of the sample without nanopowder.
doi_str_mv 10.1088/1674-1056/20/10/106202
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source Institute of Physics:Jisc Collections:IOP Publishing Read and Publish 2024-2025 (Reading List)
subjects Intermetallics
Magnesium compounds
Mg2Si
Nanocomposites
Nanomaterials
Nanostructure
Seebeck系数
Semiconductors
Silicides
Thermoelectricity
双掺杂
复合材料结构
微观结构分析
放电等离子烧结
热电性能
纳米复合材料
title Effect of nanocomposite structure on the thermoelectric properties of 0.7-at% Bi-doped Mg2Si nanocomposite
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