High temperature thermoelectric properties of Sr and Fe doped SmCoO 3 perovskite structure

Kwang Hee Jung, Soon Mok Choi, Hyung Ho Park, Won Seon Seo

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Sm1-xSrxCo1-yFeyO3 specimens with perovskite structures were prepared by a solid-state reaction to investigate their high temperature thermoelectric properties. The crystal structures of Sm1-xSrxCo1-yFeyO 3 polycrystalline samples were investigated by means of an X-ray diffraction method. All specimens showed p-type semiconducting behaviors and their electrical conductivity (σ), Seebeck coefficient (α), thermal conductivity (k) and ZT were measured at high temperatures. Effects of dopant ions on their thermoelectrical properties were also investigated. An acceptor-doping effect and distortion of the perovskite structure exerted an influence on the carrier concentration. Fe3+ ion doped into Co 3+ site enhanced the Seebeck coefficient and decreased the electrical conductivity simultaneously. On the contrary Sr2+ ion doped into Sm3+ site enhanced the electrical conductivity and decreased the Seebeck coefficient simultaneously. However heavy-doped cases (>10 mol%) caused a negative effect on the power factor values. The maximum power factor of this system, 2.0410-4 W/mK2 at 786 K was comparable to that of Ca3Co4O9 system.

Original languageEnglish
Pages (from-to)S260-S265
JournalCurrent Applied Physics
Volume11
Issue number3 SUPPL.
DOIs
Publication statusPublished - 2011 May 1

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

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