High-temperature thermoelectric and microstructural characteristics of cobalt-based oxides with ga substituted on the Co-site

N. V. Nong, S. Yanagiya, S. Monica, N. Pryds, Michitaka Ohtaki

    研究成果: ジャーナルへの寄稿記事

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    The effects of Ga substitution on the Co-site on the high-temperature thermoelectric properties and microstructure are investigated for the misfitlayered Ca 3Co 4O 9 and the complex perovskite-related Sr 3RECo 4O 10.5 (RE = rare earth) cobalt-based oxides. For both systems, substitution of Ga for Co results in a simultaneous increase in the Seebeck coefficient (S) and the electrical conductivity (σ), and the influence is more significant in the high temperature region. The power factor (S 2 σ) is thereby remarkably improved by Ga substitution, particularly at high temperatures. Texture factor calculations using x-ray diffraction pattern data for pressed and powder samples reveal that the Ga-doped samples are highly textured. Microstructure observed by scanning electron microscopy shows very well-crystallized grains for the samples with Ga substitution for Co. Among the Ga-doped samples, Ca 3Co 3.95Ga 0.05O 9 shows the best ZT value of 0.45 at 1200 K, which is about 87.5% higher than the nondoped one, a considerable improvement.

    元の言語英語
    ページ(範囲)716-722
    ページ数7
    ジャーナルJournal of Electronic Materials
    40
    発行部数5
    DOI
    出版物ステータス出版済み - 5 1 2011

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    Cobalt
    Oxides
    Substitution reactions
    cobalt
    substitutes
    oxides
    Temperature
    microstructure
    Microstructure
    Seebeck coefficient
    Seebeck effect
    Powders
    Perovskite
    Diffraction patterns
    Rare earths
    x ray diffraction
    diffraction patterns
    rare earth elements
    textures
    Textures

    All Science Journal Classification (ASJC) codes

    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Materials Chemistry

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    High-temperature thermoelectric and microstructural characteristics of cobalt-based oxides with ga substituted on the Co-site. / Nong, N. V.; Yanagiya, S.; Monica, S.; Pryds, N.; Ohtaki, Michitaka.

    :: Journal of Electronic Materials, 巻 40, 番号 5, 01.05.2011, p. 716-722.

    研究成果: ジャーナルへの寄稿記事

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    abstract = "The effects of Ga substitution on the Co-site on the high-temperature thermoelectric properties and microstructure are investigated for the misfitlayered Ca 3Co 4O 9 and the complex perovskite-related Sr 3RECo 4O 10.5 (RE = rare earth) cobalt-based oxides. For both systems, substitution of Ga for Co results in a simultaneous increase in the Seebeck coefficient (S) and the electrical conductivity (σ), and the influence is more significant in the high temperature region. The power factor (S 2 σ) is thereby remarkably improved by Ga substitution, particularly at high temperatures. Texture factor calculations using x-ray diffraction pattern data for pressed and powder samples reveal that the Ga-doped samples are highly textured. Microstructure observed by scanning electron microscopy shows very well-crystallized grains for the samples with Ga substitution for Co. Among the Ga-doped samples, Ca 3Co 3.95Ga 0.05O 9 shows the best ZT value of 0.45 at 1200 K, which is about 87.5{\%} higher than the nondoped one, a considerable improvement.",
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    AU - Nong, N. V.

    AU - Yanagiya, S.

    AU - Monica, S.

    AU - Pryds, N.

    AU - Ohtaki, Michitaka

    PY - 2011/5/1

    Y1 - 2011/5/1

    N2 - The effects of Ga substitution on the Co-site on the high-temperature thermoelectric properties and microstructure are investigated for the misfitlayered Ca 3Co 4O 9 and the complex perovskite-related Sr 3RECo 4O 10.5 (RE = rare earth) cobalt-based oxides. For both systems, substitution of Ga for Co results in a simultaneous increase in the Seebeck coefficient (S) and the electrical conductivity (σ), and the influence is more significant in the high temperature region. The power factor (S 2 σ) is thereby remarkably improved by Ga substitution, particularly at high temperatures. Texture factor calculations using x-ray diffraction pattern data for pressed and powder samples reveal that the Ga-doped samples are highly textured. Microstructure observed by scanning electron microscopy shows very well-crystallized grains for the samples with Ga substitution for Co. Among the Ga-doped samples, Ca 3Co 3.95Ga 0.05O 9 shows the best ZT value of 0.45 at 1200 K, which is about 87.5% higher than the nondoped one, a considerable improvement.

    AB - The effects of Ga substitution on the Co-site on the high-temperature thermoelectric properties and microstructure are investigated for the misfitlayered Ca 3Co 4O 9 and the complex perovskite-related Sr 3RECo 4O 10.5 (RE = rare earth) cobalt-based oxides. For both systems, substitution of Ga for Co results in a simultaneous increase in the Seebeck coefficient (S) and the electrical conductivity (σ), and the influence is more significant in the high temperature region. The power factor (S 2 σ) is thereby remarkably improved by Ga substitution, particularly at high temperatures. Texture factor calculations using x-ray diffraction pattern data for pressed and powder samples reveal that the Ga-doped samples are highly textured. Microstructure observed by scanning electron microscopy shows very well-crystallized grains for the samples with Ga substitution for Co. Among the Ga-doped samples, Ca 3Co 3.95Ga 0.05O 9 shows the best ZT value of 0.45 at 1200 K, which is about 87.5% higher than the nondoped one, a considerable improvement.

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