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...

Full description

Saved in:
Bibliographic Details
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
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/20/10/106202