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Chin. Phys. B, 2011, Vol. 20(10): 106202    DOI: 10.1088/1674-1056/20/10/106202

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

Yang Mei-Juna, Shen Qiangb, Zhang Lian-Mengb
a Centre for Materials Research and Analysis, Wuhan University of Technology, Wuhan 430070, China; State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China; b State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China
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:  thermoelectric effects      intermetallic compounds      nanostructures      semiconductors  
Received:  06 December 2010      Revised:  10 June 2011      Published:  15 October 2011
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.

Cite this article: 

Yang Mei-Jun, Shen Qiang, Zhang Lian-Meng 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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