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: Contribution to journalArticle査読

    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.
    寄稿の翻訳タイトルMicrostructures and Thermoelectric Properties of NaCo_2O_4 Prepared by Double-step Sintering
    本文言語日本語
    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
    11
    DOI
    出版ステータス出版済み - 11 15 2000

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