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Solid-State Synthesis of Magnesium Base Thermoelectric Alloys via Bulk Mechanical Alloying

Published online by Cambridge University Press:  26 February 2011

Tatsuhiko Aizawa  and
Renbo Song
Tatsuhiko Aizawa
Affiliation:
aizawa@asiaseed.org, University of Toronto, Department of Materials Sciece and Engineering, College Street 105, Toronto, M5S 3E4, Canada
Renbo Song
Affiliation:
songrb@263.net, University of Science and Technology Beijing, Beijing, 100085, China, People's Republic of
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Abstract

Magnesium binary and ternary alloy systems have been popular as a thermoelectric light-weight alloy to be working in the medium temperature range. The solid-state reactivity via the bulk mechanical alloying is applied to yield these types of alloys. The diffusion-controlled solid-state synthesis is first stated as a process to yield a binary compound, Mg2X (X = Ge, Sn and Pb). This processing is further applied to directly synthesize several ternary thermoelectric alloys Mg2Si1-xGex, Mg2Si1-ySny and Mg2Sn1-zPbz for 0.0 < x, y, z < 1.0 and to evaluate their thermoelectric properties. Hot pressing is used to make full-dense billets and samples for thermoelectric measurement. The effect of germanium and tin contents on their Seebeck coefficient and band-gap is investigated to describe the p-n transition behavior and to understand the change of electric structure with solid solution formation.

Keywords

chemical reactionthermoelectricityMg
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II04-02
Copyright
Copyright © Materials Research Society 2007

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References

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