Improvement on the high temperature thermoelectric performance of Ga-doped misfit-layered Ca3Co4-xGaxO9+δ (x = 0, 0.05, 0.1, and 0.2)

N. V. Nong, Chia Jyi Liu, Michitaka Ohtaki

    研究成果: ジャーナルへの寄稿記事

    72 引用 (Scopus)

    抄録

    Highly densified Ca3Co4-xGaxO9+δ (0 ≤ x ≤ 0.2) misfit-layered thermoelectric oxides are prepared by solid state reaction methods followed by hot-pressing. Thermoelectric properties of the samples are measured from room temperature to 1200 K. The results show that partial Ga substitution leads to a simultaneous increase of the electrical conductivity and thermopower. The Ga-doped samples have lower thermal conductivity than that of the non-doped sample in the high temperature region (>600 K). The x = 0.05 sample shows a higher figure of merit (Z = 3.37 × 10-4 K-1) than that of the non-doped sample (Z = 1.98 × 10-4 K-1) at 1073 K, indicating significant improvement of the thermoelectric performance of Ca3Co4O9+δ by partial Ga substitution for Co.

    元の言語英語
    ページ(範囲)53-56
    ページ数4
    ジャーナルJournal of Alloys and Compounds
    491
    発行部数1-2
    DOI
    出版物ステータス出版済み - 2 18 2010

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    Substitution reactions
    Thermoelectric power
    Hot pressing
    Solid state reactions
    Oxides
    Thermal conductivity
    Temperature
    Electric Conductivity

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

    これを引用

    Improvement on the high temperature thermoelectric performance of Ga-doped misfit-layered Ca3Co4-xGaxO9+δ (x = 0, 0.05, 0.1, and 0.2). / Nong, N. V.; Liu, Chia Jyi; Ohtaki, Michitaka.

    :: Journal of Alloys and Compounds, 巻 491, 番号 1-2, 18.02.2010, p. 53-56.

    研究成果: ジャーナルへの寄稿記事

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    abstract = "Highly densified Ca3Co4-xGaxO9+δ (0 ≤ x ≤ 0.2) misfit-layered thermoelectric oxides are prepared by solid state reaction methods followed by hot-pressing. Thermoelectric properties of the samples are measured from room temperature to 1200 K. The results show that partial Ga substitution leads to a simultaneous increase of the electrical conductivity and thermopower. The Ga-doped samples have lower thermal conductivity than that of the non-doped sample in the high temperature region (>600 K). The x = 0.05 sample shows a higher figure of merit (Z = 3.37 × 10-4 K-1) than that of the non-doped sample (Z = 1.98 × 10-4 K-1) at 1073 K, indicating significant improvement of the thermoelectric performance of Ca3Co4O9+δ by partial Ga substitution for Co.",
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    AU - Liu, Chia Jyi

    AU - Ohtaki, Michitaka

    PY - 2010/2/18

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    AB - Highly densified Ca3Co4-xGaxO9+δ (0 ≤ x ≤ 0.2) misfit-layered thermoelectric oxides are prepared by solid state reaction methods followed by hot-pressing. Thermoelectric properties of the samples are measured from room temperature to 1200 K. The results show that partial Ga substitution leads to a simultaneous increase of the electrical conductivity and thermopower. The Ga-doped samples have lower thermal conductivity than that of the non-doped sample in the high temperature region (>600 K). The x = 0.05 sample shows a higher figure of merit (Z = 3.37 × 10-4 K-1) than that of the non-doped sample (Z = 1.98 × 10-4 K-1) at 1073 K, indicating significant improvement of the thermoelectric performance of Ca3Co4O9+δ by partial Ga substitution for Co.

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