Mechanochemical synthesis and thermoelectric properties of high quality magnesium silicide

Sabah K. Bux*, Michael T. Yeung, Eric S. Toberer, G. Jeffrey Snyder, Richard B. Kaner, Jean Pierre Fleurial

*Corresponding author for this work

Research output: Contribution to journalArticle

147 Scopus citations

Abstract

Magnesium silicide and related alloys are attractive for thermoelectric applications due to their low toxicity, thermal stability, low density, relative abundance and low cost of production. Earlier work on the synthesis of Mg 2Si via high energy ball milling resulted in incomplete product formation, oxide impurities, and contamination from milling media. Here we present an improved solid-state synthesis of n-type magnesium silicide using the mechanochemical technique of high energy ball milling of the elements followed by high pressure sintering using hot uniaxial compaction. This robust synthetic method permits a detailed investigation of thermoelectric properties as a function of Bi doping. The thermoelectric properties of Mg2Si 1-xBix (0 ≤ x ≤ 0.021) samples are characterized from 300 K to 775 K. These results are analyzed within a single parabolic band (SPB) model to determine the effective conduction band parameters and identify regimes of non-SPB behavior.

Original languageEnglish (US)
Pages (from-to)12259-12266
Number of pages8
JournalJournal of Materials Chemistry
Volume21
Issue number33
DOIs
StatePublished - Sep 7 2011

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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