Solid state synthesis of ternary thermoelectric magnesium alloy, Mg 2Si1-xSnx

Tatsuhiko Aizawa, Renbo Song, Atsushi Yamamoto

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Profound understanding and survey of magnesium base intermetallic compounds is hindered by various difficulties in their processing and fabrication. Solid-state synthesis via the bulk mechanical alloying (BMA) is free from contaminations and segregation through high reactivity of elemental constituents against crucibles or vials. Magnesium-tin system is employed to demonstrate the solid-state reactivity to Mg2Sn from the elemental powder mixture. This process is characterized by the gradual solid-state reaction to Mg 2Sn with processing time. Since the blended mixture of magnesium and tin with the initial molar ratio of Mg66.7%Sn33.3%, is repeatedly strained via BMA in the controlled conditions, the solid-state reaction advances monotonically with refinement of interparticle distance between magnesium and tin. Ternary semi-conductive compounds, Mg2Si1-xSn x, for 0 ≦ x ≦ 1, are also synthesized by this process. Thermoelectric properties of this ternary alloy are investigated to discuss the effect of tin content on the band-gap, the thermal conductivity, the Seebeck coefficient and the figure-of-merit. In addition, these data are compared to the previously reported results by using melt and solidified samples in order to describe the common features in the solid-solution type thermoelectric compounds. Furthermore, p-n transition behavior is also reported in this ternary alloy system.

Original languageEnglish
Pages (from-to)1058-1065
Number of pages8
JournalMaterials Transactions
Volume47
Issue number4
DOIs
Publication statusPublished - 2006 Apr
Externally publishedYes

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Tin
magnesium alloys
Magnesium alloys
Magnesium
magnesium
tin
solid state
Ternary alloys
ternary alloys
Mechanical alloying
synthesis
Solid state reactions
alloying
reactivity
Seebeck coefficient
Crucibles
crucibles
Seebeck effect
Processing
figure of merit

Keywords

  • Bulk mechanical alloying
  • Mg SiSn
  • MgSn
  • Solid-state synthesis
  • Thermoelectricity

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

Solid state synthesis of ternary thermoelectric magnesium alloy, Mg 2Si1-xSnx. / Aizawa, Tatsuhiko; Song, Renbo; Yamamoto, Atsushi.

In: Materials Transactions, Vol. 47, No. 4, 04.2006, p. 1058-1065.

Research output: Contribution to journalArticle

Aizawa, Tatsuhiko ; Song, Renbo ; Yamamoto, Atsushi. / Solid state synthesis of ternary thermoelectric magnesium alloy, Mg 2Si1-xSnx. In: Materials Transactions. 2006 ; Vol. 47, No. 4. pp. 1058-1065.
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