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

Shigeru Horii, Toshiaki Kumagai, Tetsuo Uchikoshi, Tohru 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 = χ c - χ ab ) and relatively low resistivity using a crystallochemical process is reported. Doping of various rare earth (RE) ions into the Ca site in [(Bi 0.5 Pb 0.5 ) 2 Ca 2 O 4 ] y CoO 2 [(Bi, Pb)Ca222] enhanced Δχ comparable to that of [Ca 2 CoO 3-δ ] 0.62 CoO 2 . 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 [(Bi 0.5 Pb 0.5 ) 2 Sr 2 O 4 ] ∼0.55 CoO 2 .

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

Fingerprint

Bismuth
bismuth
Rare earths
rare earth elements
Doping (additives)
electrical resistivity
Magnetic anisotropy
Ions
Fabrication
anisotropy
fabrication
ions

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

Cite this

Improvement of thermoelectric performance in magnetically c-axis-oriented bismuth-based cobaltites. / Horii, Shigeru; Kumagai, Toshiaki; Uchikoshi, Tetsuo; Suzuki, Tohru; Sakka, Yoshio; Shimoyama, Jun ichi; Kishio, Kohji.

In: Scripta Materialia, Vol. 57, No. 4, 01.08.2007, p. 333-336.

Research output: Contribution to journalArticle

Horii, Shigeru ; Kumagai, Toshiaki ; Uchikoshi, Tetsuo ; Suzuki, Tohru ; Sakka, Yoshio ; Shimoyama, Jun ichi ; Kishio, Kohji. / Improvement of thermoelectric performance in magnetically c-axis-oriented bismuth-based cobaltites. In: Scripta Materialia. 2007 ; Vol. 57, No. 4. pp. 333-336.
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AU - Shimoyama, Jun ichi

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