Solid-State Synthesis of Mg2X (X=Si, Ge, Sn and Pb) via Bulk Mechanical Alloying

Tatsuhiko Aizawa; Ren Bo Song

doi:10.4028/www.scientific.net/MSF.534-536.221

Paper Titles

Mg-Y-Cu Bulk Metallic Glass Obtained by Mechanical Alloying and Powder Consolidation
p.205

Nanocrystalline and Ultrafine Grained Materials by Mechanical Alloying
p.209

Precipitation Behavior of γ" in Severely Plastic Deformed Ni-Base Alloys
p.213

Sintering Behavior of TiC-Fe Based Composite Fabricated by Spark Plasma Sintering Using TiH₂ Graphite Powders
p.217

Solid-State Synthesis of Mg₂X (X=Si, Ge, Sn and Pb) via Bulk Mechanical Alloying
p.221

Synthesis of Titanium Carbide by Heat Treatment of TiH₂ and Carbon Black Powders
p.225

The Magnetic and Photo-Catalytic Properties of Fe Doped TiO₂ Nanocrystalline Powder Synthesized by Mechanical Alloying
p.229

Thermal Stability of Amorphous Ti- Cu- Ni- Sn Prepared by Mechanical Alloying
p.233

Analysis of Failure Mechanisms during Powder Compaction
p.237

HomeMaterials Science ForumMaterials Science Forum Vols. 534-536Solid-State Synthesis of Mg2X (X=Si, Ge, Sn and...

Solid-State Synthesis of Mg₂X (X=Si, Ge, Sn and Pb) via Bulk Mechanical Alloying

Abstract:

Magnesium base alloys and compounds are attractive for various applications as a functional material. In particular, a series of binary system by Mg2X (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 semiconductive compounds: high vaporizing pressure and mechanical adhesion of magnesium, reaction of germanium and tin with crucibles, and, difference of melting point among elements, X. Solidstate processing via the bulk mechanical alloying enables us to directly fabricate these Mg2X semiconductive materials in high density performs. The precise control of chemical composition leads to an investigation on the dilution and enrichment of X in Mg2X. Two types of solid-state reactivity are introduced: e.g. synthesis of Mg2Si from an elemental mixture Mg – Si, which is a nucleationcontrolled process, while synthesis of Mg2Sn from Mg – Sn is a diffusion-controlled process. The thermoelectricity of these Mg2X is evaluated for discussion on the validity and effectiveness of this new PM route as a reliable tool for fabrication of thermoelectric compounds.