Enhanced thermoelectric properties of chimney-ladder type higher manganese silicides

Yuzuru Miyazaki, Haruki Hamada, Yuta Kikuchi, Kei Hayashi

Research output: Contribution to journalReview articlepeer-review

Abstract

To further enhance thermoelectric (TE) properties of higher manganese silicides (HMSs), the dissipation of layered precipitates of the MnSi phase as well as the optimization of the hole carrier concentration are critical. We have systematically studied electronic structure of partially substituted solid solutions of (Mn1-xMx)Si1.7 with M = transition metals and prepared bulk samples of such solid solutions by spark plasma sintering. A 2 at% substitution of manganese with vanadium is found to dissipate the MnSi-precipitates effectively, results in a substantial increase in electrical conductivity from 3 × 104 S/m to approximately 5 × 104 S/m at 800 K. The resulting TE power factor reaches 1.86 mW/K2m at 710 K, 30% higher than that of V-free samples.

Original languageEnglish
Pages (from-to)461-466
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume64
Issue number8
DOIs
Publication statusPublished - 2017 Aug

Keywords

  • Chimney-ladder phase
  • Higher manganese silicide
  • Incommensurate composite crystal
  • Thermoelectric properties
  • Valence electron counts

ASJC Scopus subject areas

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

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