Solid state synthesis and thermoelectric properties of Mg-Si-Ge system

Renbo Song, Yazheng Liu, Tatsuhiko Aizawa

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Thermoelectric materials, Mg2Si1-xGex (x=0, 0.2, 0.4, 0.6, 0.8, 1), have been prepared by bulk mechanical alloying (BMA) and hot pressing (HP). The electrical conductivity, Seebeck coefficient and thermal conductivity were measured from room temperature up to about 700 K. The electrical conductivity of all the samples increases with increasing temperature, while the Seebeck coefficient and thermal conductivity decrease with increasing temperature. Mg2Si and Mg2Si0.8Ge0.2 possess negative type of conductivity, while for other compounds it is positive. At the same time, the effect of hot processing condition on thermoelectric properties was also investigated. The maximum figure of merit of Mg2Si0.6Ge0.4 was obtained with the processing parameter of BMA at 600 cycles and hot pressing at 773 K and 1 GPa for 1 h.

Original languageEnglish
Pages (from-to)618-622
Number of pages5
JournalJournal of Materials Science and Technology
Volume21
Issue number5
Publication statusPublished - 2005 Sep
Externally publishedYes

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Keywords

  • Bulk mechanical alloying
  • Hot pressing
  • MgSiGe
  • Solid-state synthesis
  • Thermoelectric

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

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