Co-doping of Al and Bi to control the transport properties for improving thermoelectric performance of Mg2Si

Gwansik Kim, Jeongmin Kim, Hwijong Lee, Sungmee Cho, Inwoong Lyo, Sujung Noh, Byung Wook Kim, Sung Wng Kim, Kyu Hyoung Lee, Wooyoung Lee

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Abstract

We investigated the thermoelectric properties of Al and Bi co-doped Mg2Si polycrystalline bulks fabricated using a solid state reaction combined with the spark plasma sintering technique. Through controlled doping of Al and Bi, the power factor could be enhanced due to an increase in the Seebeck coefficient benefiting from an enhancement of the density of states effective mass. The lattice thermal conductivity was reduced due to intensified point-defect phonon scattering originating from the mass difference between the host Si atoms and Bi dopants. By these synergetic effects, the dimensionless figure of merit (ZT) of 1.02 was obtained at 873 K.

Original languageEnglish
Pages (from-to)11-15
Number of pages5
JournalScripta Materialia
Volume116
DOIs
Publication statusPublished - 2016 Apr 15

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All Science Journal Classification (ASJC) codes

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

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