Crystal structure and thermoelectric properties of partially-substituted melt-grown higher manganese silicides

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Abstract

Crystal structure and thermoelectric properties of several partially-substituted higher manganese silicides (HMSs) samples have been reviewed. HMSs possess a unique incommensurate crystal structure consisting of two subsystems of [Mn] and [Si] and the structure formula is thus represented as MnSiγ. The c-axis length ratio, γ, changes with temperature to yield the MnSi (monosilicide) striations, which deteriorate mechanical strength and electrical conductivity. A small amount of V-substitution effectively dissipates such striations and enhances hole carrier concentration. Thus prepared V-substituted samples exhibit the highest power factor and remarkably lower thermal conductivity. The nanostructure of such samples consists of regular and highly disordered nano-domains of Si atoms, which would further reduce the thermal conductivity to enhance thermoelectric figure-of-merit.

Original languageEnglish
Article numberSF0802
JournalJapanese journal of applied physics
Volume59
Issue numberSF
DOIs
Publication statusPublished - 2020 Apr 1

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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