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

doi:10.1016/j.scriptamat.2007.04.022

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

Graduate School of Advanced Science and Engineering

Research output: Contribution to journal › Article

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_0.5Pb_0.5)₂Ca₂O₄]_yCoO₂ [(Bi, Pb)Ca222] enhanced Δχ comparable to that of [Ca₂CoO_3-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 [(Bi_0.5Pb_0.5)₂Sr₂O₄]_∼0.55 CoO₂.

Original language	English
Pages (from-to)	333-336
Number of pages	4
Journal	Scripta Materialia
Volume	57
Issue number	4
DOIs	https://doi.org/10.1016/j.scriptamat.2007.04.022
Publication status	Published - 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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Horii, S., Kumagai, T., Uchikoshi, T., Suzuki, T. S., Sakka, Y., Shimoyama, J. I., & Kishio, K. (2007). Improvement of thermoelectric performance in magnetically c-axis-oriented bismuth-based cobaltites. Scripta Materialia, 57(4), 333-336. https://doi.org/10.1016/j.scriptamat.2007.04.022

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title = "Improvement of thermoelectric performance in magnetically c-axis-oriented bismuth-based cobaltites",

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.",

keywords = "Electrical resistivity, Layered structure, Magnetic anisotropy, Magnetic grain-alignment, Oxides",

author = "Shigeru Horii and Toshiaki Kumagai and Tetsuo Uchikoshi and Suzuki, {Tohru S.} and Yoshio Sakka and Shimoyama, {Jun ichi} and Kohji Kishio",

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doi = "10.1016/j.scriptamat.2007.04.022",

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AU - Horii, Shigeru

AU - Kumagai, Toshiaki

AU - Uchikoshi, Tetsuo

AU - Suzuki, Tohru S.

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 = 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.

AB - 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.

KW - Electrical resistivity

KW - Layered structure

KW - Magnetic anisotropy

KW - Magnetic grain-alignment

KW - Oxides

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