Work

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

Year: 2011

Type: article

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.

Source: Chinese Physics B

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

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

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: bronze

Funders: National Key Research and Development Program of China, Fundamental Research Funds for the Central Universities

Award: G1790411698