Improvement of thermoelectric performance in magnetically c-axis-oriented bismuth-based cobaltites

Shigeru Horii, Toshiaki Kumagai, Tetsuo Uchikoshi, Tohru S. Suzuki, Yoshio Sakka, Jun ichi Shimoyama, Kohji Kishio

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Fabrication of thermoelectric Bi-based cobaltites with large magnetic anisotropy (Δχ = χc - χab) and relatively low resistivity using a crystallochemical process is reported. Doping of various rare earth (RE) ions into the Ca site in [(Bi0.5Pb0.5)2Ca2O4]yCoO2 [(Bi, Pb)Ca222] enhanced Δχ comparable to that of [Ca2CoO3-δ]0.62CoO2. Tailoring of the Sr-doping level in Dy-doped (Bi, Pb)Ca222 enabled the resistivity to be reduced without decreasing Δχ. The magnetically c-axis-oriented (Sr, Dy)-doped (Bi, Pb)Ca222 bulk exhibited improved thermoelectric performance compared with the Sr-free RE-doped BiCa222 and a-axis grain-oriented [(Bi0.5Pb0.5)2Sr2O4]∼0.55 CoO2.

Original languageEnglish
Pages (from-to)333-336
Number of pages4
JournalScripta Materialia
Volume57
Issue number4
DOIs
Publication statusPublished - 2007 Aug 1

Keywords

  • Electrical resistivity
  • Layered structure
  • Magnetic anisotropy
  • Magnetic grain-alignment
  • Oxides

ASJC Scopus subject areas

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

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