Nano Archive

Effect of nanocomposite structure on the thermoelectric properties of 0.7-at% Bi-doped Mg 2 Si nanocomposite

Mei-Jun, Yang and Qiang, Shen and Lian-Meng, Zhang (2011) Effect of nanocomposite structure on the thermoelectric properties of 0.7-at% Bi-doped Mg 2 Si nanocomposite. Chinese Physics B, 20 (10). p. 106202.

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Official URL: http://stacks.iop.org/1674-1056/20/i=10/a=106202

Abstract

Nanocomposites offer a promising approach to the incorporation of nanostructured constituents into bulk thermoelectric materials. The 0.7-at% Bi-doped Mg 2 Si nanocomposites are prepared by spark plasma sintering of the mixture of nanoscale and microsized 0.7-at% Bi-doped Mg 2 Si 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 Mg 2 Si nanocomposite with 50-wt % nanopowder, which is about twice larger than that of the sample without nanopowder.

Item Type:Article
ID Code:11130
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:23
Last Modified:02 Nov 2011 00:47

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