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 language | English |
|---|---|
| Pages (from-to) | 333-336 |
| Number of pages | 4 |
| Journal | Scripta Materialia |
| Volume | 57 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 2007 Aug 1 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Improvement of thermoelectric performance in magnetically c-axis-oriented bismuth-based cobaltites
AU - Horii, Shigeru
AU - Kumagai, Toshiaki
AU - Uchikoshi, Tetsuo
AU - Suzuki, Tohru
AU - Sakka, Yoshio
AU - Shimoyama, Jun ichi
AU - Kishio, Kohji
PY - 2007/8/1
Y1 - 2007/8/1
N2 - 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 .
AB - 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 .
KW - Electrical resistivity
KW - Layered structure
KW - Magnetic anisotropy
KW - Magnetic grain-alignment
KW - Oxides
UR - http://www.scopus.com/inward/record.url?scp=34249876326&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34249876326&partnerID=8YFLogxK
U2 - 10.1016/j.scriptamat.2007.04.022
DO - 10.1016/j.scriptamat.2007.04.022
M3 - Article
AN - SCOPUS:34249876326
VL - 57
SP - 333
EP - 336
JO - Scripta Materialia
JF - Scripta Materialia
SN - 1359-6462
IS - 4
ER -