Cation distribution dependence on thermoelectric properties of doped spinel M 0.6Fe 2.4O 4

Tomohiro Nozaki, Kei Hayashi, Yuzuru Miyazaki, Tsuyoshi Kajitani

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The electrical conductivity, Seebeck coefficient, and thermal conductivity of polycrystalline M 0.6Fe 2.4O 4 (M = Ni, Ni 0.5Mg 0.5, Ni 0.5Zn 0.5, Zn) were measured to elucidate cation distribution-dependent changes. Preferential occupation by the doped cation in the iron spinel has been noted: Zn 2+ ions prefer to occupy the tetrahedral A-site, while Ni 2+ and Mg 2+ prefer to occupy the octahedral B-site. While the electrical conductivity and Seebeck coefficient are almost cation distribution-independent, the thermal conductivity at room temperature is sensitive to the cation distributions. The lowest thermal conductivity of 2.0Wm -1K -1 at room temperature is observed for Zn 0.6Fe 2.4O 4. The value is about one third of that of Ni 0.6Fe 2.4O 4. The thermal transport of MxFe3 xO4 is mainly affected by cation distribution at the A-site, while the electrical transport is affected by the B-site, which is discussed in terms of the point defects at the A- and B-sites. Due to the disordering at the A- and Bsites, the thermal conductivity of M xFe 3-xO 4 could be reduced without decreasing the electrical conductivity. Doped spinel-ferrite M xFe 3-xO 4 would be a kind of "phonon-glass electron-crystal" material.

Original languageEnglish
Pages (from-to)1164-1168
Number of pages5
JournalMaterials Transactions
Volume53
Issue number6
DOIs
Publication statusPublished - 2012 Oct 5

Keywords

  • Cation distribution
  • Ferrite
  • Solid solution
  • Spinel
  • Thermal conductivity

ASJC Scopus subject areas

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

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