Preparation and thermoelectric properties of Mg2Si fabricated by one-step synthesis method

Yang Li, Shao Ping Chen, Yuan Yuan Jiao, Bo Zeng, Qing Sen Meng, Tang Hong Yi, S. M. Kauzlarich, D. V. Quanch, Z. A. Munir

Research output: Contribution to journalArticle

Abstract

High-purity magnesium hydride(MgH2), silicon(Si) and bismuth(Bi) powders were selected as the raw materials to prepare Bi (1mol%)-doped Mg2Si thermoelectric materials by field-activated and pressure-assisted synthesis(FAPAS) in one step. The synthesis process, phase component and thermoelectric properties were studied, and the results was also compared with that prepared from tube furnace process followed by FAPAS (T+F).The results shows that it's feasible to prepare Mg2Si pellet with high purity, nano-structure and also lower thermal conductivity in short time in one-step method, which improves the figure of merit greatly. Meanwhile, a little bit extra silicon particle was helpful to improve the thermoelectric performance of materials, so the sample with a ratio of 1.95∶1 has higher ZT value than that of 2∶1. At 725 K, ZT value of the former reaches 0.54.

Original languageEnglish (US)
JournalGongneng Cailiao/Journal of Functional Materials
Volume45
Issue number16
DOIs
StatePublished - Aug 30 2014

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Keywords

  • FAPAS
  • MgSi
  • MgH
  • One-step synthesis
  • Thermoelectric material

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Materials Chemistry

Cite this

Li, Y., Chen, S. P., Jiao, Y. Y., Zeng, B., Meng, Q. S., Yi, T. H., Kauzlarich, S. M., Quanch, D. V., & Munir, Z. A. (2014). Preparation and thermoelectric properties of Mg2Si fabricated by one-step synthesis method. Gongneng Cailiao/Journal of Functional Materials, 45(16). https://doi.org/10.3969/j.issn.1001-9731.2014.16.023