Synthesis of Mn(AlxSi1-x)2+δ solid solutions using naaisi and their thermoelectric properties

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Abstract

Polycrystalline homogeneous samples of Mn(AlxSi 1-x)2+δ solid solutions were synthesized by heating the compacts of Mn, NaAISi and Si powder mixtures with molar ratios Mn: Al: Si = 0.95: y: 2.05-y (y = 0.80, 0.85, 0.90)at 1173 K for 12 h, followed by rinsing the samples with alcohol and water. The chemical analysis of the samples revealed that Mn(AlxSi1-x)2+δ solid solutions were formed with composition ranges of 0.37≤x≤0.40 and 8= 0.04-0.08, and approximately 0.4 wt.% of Na was contaminated. The bulk sample of MnAl0.80Si1.25, which was prepared from the starting mixtures with y = 0.85 and sintered at 1153-1178 K and 40 MPa for 10 min by the pulsed electric current sintering method, showed the highest thermoelectric figure of merit at 622 K (ZT=0.15).

Original languageEnglish
Pages (from-to)180-184
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume59
Issue number4
DOIs
Publication statusPublished - 2012 Apr

Keywords

  • Low-temperature synthesis
  • Mn-Al-Si compound
  • Thermoelectric property

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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