2段階焼結法で合成したNaCo_2O_4焼結体の微細構造と熱電特性

大瀧 倫卓, 前田 英司

    研究成果: ジャーナルへの寄稿記事

    抄録

    The thermoelectric properties of sintered bodies of NaCo<SUB>2</SUB>O<SUB>4</SUB>, 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 NaCo<SUB>2</SUB>O<SUB>4</SUB> 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<SUP>-3</SUP>K<SUP>-1</SUP> at 600°C, and the maximum ZT of 0.78 at 800°C.
    元の言語Japanese
    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 - 11 15 2000

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    Oxides
    Sintering
    Microstructure
    Seebeck coefficient
    Crystallites
    Calcination
    Electric Conductivity

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    2段階焼結法で合成したNaCo_2O_4焼結体の微細構造と熱電特性. / 大瀧倫卓; 前田英司.

    :: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, 巻 47, 番号 11, 15.11.2000, p. 1159-1164.

    研究成果: ジャーナルへの寄稿記事

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    abstract = "The thermoelectric properties of sintered bodies of NaCo<SUB>2O<SUB>4, 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 NaCo<SUB>2O<SUB>4 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<SUP>-3K<SUP>-1 at 600°C, and the maximum ZT of 0.78 at 800°C.",
    author = "倫卓 大瀧 and 英司 前田",
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    T1 - 2段階焼結法で合成したNaCo_2O_4焼結体の微細構造と熱電特性

    AU - 大瀧, 倫卓

    AU - 前田, 英司

    PY - 2000/11/15

    Y1 - 2000/11/15

    N2 - The thermoelectric properties of sintered bodies of NaCo<SUB>2O<SUB>4, 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 NaCo<SUB>2O<SUB>4 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<SUP>-3K<SUP>-1 at 600°C, and the maximum ZT of 0.78 at 800°C.

    AB - The thermoelectric properties of sintered bodies of NaCo<SUB>2O<SUB>4, 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 NaCo<SUB>2O<SUB>4 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<SUP>-3K<SUP>-1 at 600°C, and the maximum ZT of 0.78 at 800°C.

    U2 - 10.2497/jjspm.47.1159

    DO - 10.2497/jjspm.47.1159

    M3 - 記事

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    JO - Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy

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    SN - 0532-8799

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