TY - GEN
T1 - Solid-state synthesis of Mg2X (X=Si, Ge, Sn and Pb) via bulk mechanical alloying
AU - Aizawa, Tatsuhiko
AU - Song, Renbo
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
KW - Bulk mechanical alloying
KW - Intermetallic compounds
KW - MgX
KW - Semi-conductivity
KW - Solid state synthesis
KW - Thermoelectricity
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U2 - 10.4028/0-87849-419-7.221
DO - 10.4028/0-87849-419-7.221
M3 - Conference contribution
AN - SCOPUS:38349113992
SN - 0878494197
SN - 9780878494194
T3 - Materials Science Forum
SP - 221
EP - 224
BT - Progress in Powder Metallurgy - Proceedings of the 2006 Powder Metallurgy World Congress and Exhibition (PM 2006)
PB - Trans Tech Publications Ltd
T2 - 2006 Powder Metallurgy World Congress and Exhibition, PM 2006
Y2 - 24 September 2006 through 28 September 2006
ER -