Synthesis of Mg2Si1-xSnx solid solutions as thermoelectric materials by bulk mechanical alloying and hot pressing

R. B. Song, T. Aizawa, J. Q. Sun

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

Bulk mechanical alloying with combination of hot pressing is proposed to prepare Mg2Si1-xSnx (x = 0, 0.2, 0.4, 0.6, 0.8, 1.0) solid solutions as thermoelectric materials from elemental granules. Hot pressing condition is optimized in order to obtain higher figure of merit. Temperature dependence of the electrical conductivity, the Seebeck coefficient and thermal conductivity were measured from the room temperature up to 700 K. It was found that the thermoelectric properties of Mg2Si1-xSnx were sensitive to the tin concentration. The p-n conversion takes place at the vicinity of x = 0.2, where the Seebeck coefficient drastically changes its sign. A maximum figure of merit of 0.13 was obtained at 653 K in the samples with nominal compositions of Mg2Si0.4Sn0.6 and Mg2Si.

Original languageEnglish
Pages (from-to)111-117
Number of pages7
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume136
Issue number2-3
DOIs
Publication statusPublished - 2007 Jan 25

Keywords

  • Bulk mechanical alloying
  • Hot pressing
  • MgSiSn
  • Solid-state synthesis
  • Thermoelectric materials

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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