Solid-state synthesis of Mg2X (X=Si, Ge, Sn and Pb) via bulk mechanical alloying

Tatsuhiko Aizawa, Renbo Song

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

3 Citations (Scopus)

Abstract

Magnesium base alloys and compounds are attractive for various applications as a functional material. In particular, a series of binary system by Mg 2X (X = Si, Ge, Sn and Pb) has fascinated many researchers and engineers by its thermoelectric properties and semi-conductive performance. Many barriers in its processing rejects precise investigation of these types of semi-conductive compounds: high vaporizing pressure and mechanical adhesion of magnesium, reaction of germanium and tin with crucibles, and, difference of melting point among elements, X. Solid-state processing via the bulk mechanical alloying enables us to directly fabricate these Mg2X semi-conductive materials in high density performs. The precise control of chemical composition leads to an investigation on the dilution and enrichment of X in Mg 2X. Two types of solid-state reactivity are introduced: e.g. synthesis of Mg2Si from an elemental mixture Mg - Si, which is a nucleation-controlled process, while synthesis OfMg2Sn from Mg - Sn is a diffusion-controlled process. The thermoelectricity of these Mg 2X is evaluated for discussion on the validity and effectiveness of this new PM route as a reliable tool for fabrication of thermoelectric compounds.

Original languageEnglish
Title of host publicationProgress in Powder Metallurgy - Proceedings of the 2006 Powder Metallurgy World Congress and Exhibition (PM 2006)
Pages221-224
Number of pages4
EditionPART 1
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 1
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

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Keywords

  • Bulk mechanical alloying
  • Intermetallic compounds
  • MgX
  • Semi-conductivity
  • Solid state synthesis
  • Thermoelectricity

ASJC Scopus subject areas

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

Cite this

Aizawa, T., & Song, R. (2007). Solid-state synthesis of Mg2X (X=Si, Ge, Sn and Pb) via bulk mechanical alloying. In Progress in Powder Metallurgy - Proceedings of the 2006 Powder Metallurgy World Congress and Exhibition (PM 2006) (PART 1 ed., pp. 221-224). (Materials Science Forum; Vol. 534-536, No. PART 1).