Crystal structure and thermoelectric properties of chimney-ladder higher manganese silicides

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2 Citations (Scopus)

Abstract

Crystal structure, electronic structure and thermoelectric (TE) properties of Nowotny chimney-ladder (NCL) higher manganese silicides (HMSs) are reviewed. According to a (3+1)-dimensional superspace approach, HMSs are revealed to belong to incommensurate composite crystals, wherein [Mn] and [Si] subsystems possess an irrational c-axis ratio γ=cMn/cSi. The γ parameter, also represents a stoichiometry of the HMSs as MnSiγ, dictates the electronic structure, directly relating to a valence electron counting number, VEC. The p-type TE performance can be enhanced by a partial substitution of V, Cr, etc., while n-type HMSs can be obtained by heavily substituting Mn with Fe, etc., to realize VEC>14. A unique thermal expansion has been discovered at T∼800 K, which would deteriorate TE performance and hence to be avoided from a practical application point of view.

Original languageEnglish
Pages (from-to)530-537
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume79
Issue number11
DOIs
Publication statusPublished - 2015 Jan 1

Keywords

  • Chimney-ladder compounds
  • Composite crystals
  • Higher manganese silicides
  • Incommensurate
  • Thermal expansion
  • Thermoelectric materials
  • Valence electron counts

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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