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

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

中国物理B ›› 2011, Vol. 20 ›› Issue (10): 106202-106202.doi: 10.1088/1674-1056/20/10/106202

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

杨梅君¹, 沈强², 张联盟²

(1)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; (2)State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

收稿日期:2010-12-06 修回日期:2011-06-10 出版日期:2011-10-15 发布日期:2011-10-15
基金资助:
Project supported by the National Basic Research Program of China (Grant No. 2007CB607501) and the Fundamental Research Funds for the Central Universities.

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

Yang Mei-Jun(杨梅君)^a)b)†, Shen Qiang(沈强)^b), and Zhang Lian-Meng(张联盟)^b)

^a Centre for Materials Research and Analysis, 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

Received:2010-12-06 Revised:2011-06-10 Online:2011-10-15 Published:2011-10-15
Supported by:
Project supported by the National Basic Research Program of China (Grant No. 2007CB607501) and the Fundamental Research Funds for the Central Universities.

摘要/Abstract

摘要： 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.

关键词: intermetallic compounds, nanostructures, semiconductors, thermoelectric effects

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.

Key words: intermetallic compounds, nanostructures, semiconductors, thermoelectric effects

中图分类号: (Composites (nanosystems embedded in a larger structure))

62.23.Pq

杨梅君, 沈强, 张联盟. Effect of nanocomposite structure on the thermoelectric properties of 0.7-at% Bi-doped Mg₂Si nanocomposite[J]. 中国物理B, 2011, 20(10): 106202-106202.

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[J]. Chin. Phys. B, 2011, 20(10): 106202-106202.

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

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

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