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

*この研究の対応する著者

研究成果: Article査読

6 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)333-336
ページ数4
ジャーナルScripta Materialia
57
4
DOI
出版ステータスPublished - 2007 8
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学
  • 金属および合金

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