Structural and thermoelectric properties of chimney-ladder compounds in the Ru-Mn-Si system

Norihiko L. Okamoto, Tatsuya Koyama, Kyosuke Kishida, Katsushi Tanaka, Haruyuki Inui

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

We have investigated phase relationships of the sesquisilicide alloys in the Ru-Mn-Si system. A series of chimney-ladder phases Ru 1-x Mn x Si y (0.14 ≤ x ≤ 0.97, 1.584 ≤ y ≤ 1.741) are formed over a wide compositional range between Ru 2Si 3 and Mn 4Si 7. We also investigated thermoelectric properties of the directionally solidified Ru 1-x Mn x Si y alloys as a function of Mn content and temperature. The dimensionless figure of merit ZT for alloys with high Mn content (x ≥ 0.75) increases as the Mn content increases. The alloy with x = 0.90 exhibits ZT as high as 0.76 at 874 K.

Original languageEnglish
Pages (from-to)1640-1644
Number of pages5
JournalJournal of Electronic Materials
Volume39
Issue number9
DOIs
Publication statusPublished - 2010 Sep 1
Externally publishedYes

Keywords

  • Transition-metal silicide
  • thermal conductivity
  • transmission electron microscopy (TEM)
  • valence electron count (VEC)

ASJC Scopus subject areas

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

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