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

doi:10.1088/1674-1056/20/10/106202

Abstract Nanocomposites offer a promising approach to the incorporation of nanostructured constituents into bulk thermoelectric 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 structure 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.

Keywords: intermetallic compounds nanostructures semiconductors thermoelectric effects

Received: 06 December 2010
Revised: 10 June 2011
Accepted manuscript online:

PACS:

62.23.Pq

(Composites (nanosystems embedded in a larger structure))

Fund: Project supported by the National Basic Research Program of China (Grant No. 2007CB607501) and the Fundamental Research Funds for the Central Universities.

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Yang Mei-Jun(杨梅君), Shen Qiang(沈强), and Zhang Lian-Meng(张联盟) Effect of nanocomposite structure on the thermoelectric properties of 0.7-at% Bi-doped Mg₂Si nanocomposite 2011 Chin. Phys. B 20 106202

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

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