Thermoelectric material design in pseudo binary systems of Mg2Si - Mg2Ge - Mg2Sn on the powder metallurgy route

Tatsuhiko Aizawa, Renbo Song, Atsushi Yamamoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Fundamental studies on the thermoelectricity have been mainly done in the pseudo binary systems of Mg2Si - Mg2Ge - Mg2Sn. In recent years, their thermoelectricity is revisited because of light-weight, low initial const and short turning back time in addition to high potential in figure-of-merit for ZT approaching to unity or more. Conventional melting and solidification, or, normal PM routes fail in precise, wide-range control of chemical composition and microstructure control. New PM route via bulk mechanical alloying is developed to fabricate the solid solution semi-conductive materials with Mg2Si1-xGex and Mg 2Si1-ySny for 0 < x, y < 1 and to investigate their thermoelectric materials. Since Mg2Si is n-type and both Mg2Ge and Mg2Sn are p-type, pntransition takes place at the specified range of germanium content, x, and tin content, y. Through optimization of chemical composition, solid-solution type thermoelectric semi-conductive materials are designed both for n- and p-type materials. In addition, appropriate doping condition can be searched in the specified range of x and y.

Original languageEnglish
Title of host publicationProgress in Powder Metallurgy - Proceedings of the 2006 Powder Metallurgy World Congress and Exhibition (PM 2006)
Pages1553-1556
Number of pages4
EditionPART 2
Publication statusPublished - 2007 Dec 1
Event2006 Powder Metallurgy World Congress and Exhibition, PM 2006 - Busan, Korea, Republic of
Duration: 2006 Sep 242006 Sep 28

Publication series

NameMaterials Science Forum
NumberPART 2
Volume534-536
ISSN (Print)0255-5476

Conference

Conference2006 Powder Metallurgy World Congress and Exhibition, PM 2006
CountryKorea, Republic of
CityBusan
Period06/9/2406/9/28

Keywords

  • Bandgap
  • Bulk mechanical alloying
  • MgSiGe
  • MgSiSn
  • Pntransition
  • Solid state synthesis

ASJC Scopus subject areas

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

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    Aizawa, T., Song, R., & Yamamoto, A. (2007). Thermoelectric material design in pseudo binary systems of Mg2Si - Mg2Ge - Mg2Sn on the powder metallurgy route. In Progress in Powder Metallurgy - Proceedings of the 2006 Powder Metallurgy World Congress and Exhibition (PM 2006) (PART 2 ed., pp. 1553-1556). (Materials Science Forum; Vol. 534-536, No. PART 2).