Crystal Structure and thermoelectric properties of Mn-substituted Ru 2Si3 with the chimney-ladder structure

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

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Phase relationships of manganese-substituted ruthenium sesquisilicide alloys have been investigated by using scanning and transmission electron microscopy. A series of chimney-ladder phases Ru1-xMn xSiy, are formed over a wide compositional range between Ru2Si3 and Mn4Si7. The thermoelectric properties of the directionally solidified alloys with the nominal compositions of Ru1-xMnxSiy(0.55 ≤ x ≥ 0.90) have been investigated as a function of the Mn content and temperature. The thermoelectric power factor and dimensionless figure-of-merit (ZT) for the alloys with high Mn contents (x ≥ 0.75) increase with the increase in the Mn content. The ZT value for the crystal with x = 0.90 is as high as 0.76 at 874 K.

Original languageEnglish
Pages (from-to)173-178
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume1128
Publication statusPublished - 2009 Nov 17
Externally publishedYes
Event2008 MRS Fall Meeting - Boston, MA, United States
Duration: 2008 Dec 22008 Dec 5

ASJC Scopus subject areas

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

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