Improvement of thermoelectric properties of chimney-ladder compounds by introducing high-density interfaces

Norihiko L. Okamoto, Haruyuki Inui

Research output: Contribution to journalReview articlepeer-review


Phase relationships of Mn-substituted Ru2Si3 with the chimney-ladder structure have been investigated by using scanning and transmission electron microscopy. A series of chimney-ladder phases Ru 1-xMnxSiy are formed over a wide compositional range between Ru2Si3 and Mn4Si7. The c-axis dimension of the Si subcell increases with the Mn content accompanied with the increase in the Si/M ratio (y = Si/(Ru + Mn)). A large extent of compositional variation is observed in the directionally solidified chimney-ladder compounds. The interface between adjacent chimney-ladder phases with different Mn contents is considered to have no influence on the electrical properties but have some influence on the lattice thermal conductivity. The dimensionless figure-of-merit increases with the increase in the density of the interfaces.

Original languageEnglish
Pages (from-to)175-179
Number of pages5
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Issue number4
Publication statusPublished - 2012 Apr
Externally publishedYes


  • Chimney-ladder structure
  • Interface structure
  • Thermoelectric properties
  • Transition-metal silicide
  • Transmission electron microscopy

ASJC Scopus subject areas

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


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