Microstructures and thermoelectric properties of NaCo2O4 prepared by double-step sintering

Michitaka Ohtaki, Eishi Maeda

    研究成果: ジャーナルへの寄稿記事

    24 引用 (Scopus)

    抄録

    The thermoelectric properties of sintered bodies of NaCo2O4, which is so far the most promising p-type candidate for oxide thermoelectric material, are investigated in terms of their sintering conditions. Double-step sintering, for which single-phase NaCo2O4 obtained by calcination and sintering with addition of 10% excess of Na each time is re-ground and sintered again, is revealed to attain a marked improvement in the thermoelectric performance of the oxide. The improvement is due to increase in both Seebeck coefficient and electrical conductivity, and is attributed to a distinct enhancement of the two-dimensionality in the crystallites constituting the sintered body. The oxide sintered body consequently attains the figure-of-merit of 0.88×10-3 K-1 at 600 °C, and the maximum ZT of 0.78 at 800 °C.

    元の言語英語
    ページ(範囲)1159-1164
    ページ数6
    ジャーナルFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
    47
    発行部数11
    DOI
    出版物ステータス出版済み - 1 1 2000

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    Oxides
    Sintering
    Microstructure
    Seebeck coefficient
    Crystallites
    Calcination
    Electric Conductivity

    All Science Journal Classification (ASJC) codes

    • Mechanical Engineering
    • Industrial and Manufacturing Engineering
    • Metals and Alloys
    • Materials Chemistry

    これを引用

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    abstract = "The thermoelectric properties of sintered bodies of NaCo2O4, which is so far the most promising p-type candidate for oxide thermoelectric material, are investigated in terms of their sintering conditions. Double-step sintering, for which single-phase NaCo2O4 obtained by calcination and sintering with addition of 10{\%} excess of Na each time is re-ground and sintered again, is revealed to attain a marked improvement in the thermoelectric performance of the oxide. The improvement is due to increase in both Seebeck coefficient and electrical conductivity, and is attributed to a distinct enhancement of the two-dimensionality in the crystallites constituting the sintered body. The oxide sintered body consequently attains the figure-of-merit of 0.88×10-3 K-1 at 600 °C, and the maximum ZT of 0.78 at 800 °C.",
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