Sintering process and nonstoichiometry of NaCo2O4 layered thermoelectric oxide

M. Ohtaki, K. Shouji

    研究成果: 書籍/レポート タイプへの寄稿会議への寄与

    3 被引用数 (Scopus)

    抄録

    Sintering process of layered oxide NaCo2O4, which has been the best p-type thermoelectric oxide candidate to date since its debut in the world of thermoelectrics in 1997, was investigated in terms of sodium nonstoichiometry occurring during solid state reaction between Na2CO3 and Co3O4 for the synthesis of the oxide. Thermal gravimetry (TG) and differential thermal analysis (DTA) measurements revealed that solid-gas equilibrium plays an important role on phase formation process and on controlling chemical composition of the oxide, Partial pressure of oxygen and carbon dioxide in the reaction atmosphere was revealed to be crucial for controlling vaporization of Na, as well as for promotion of phase formation reaction of NaCo2O4, In particular, whereas the CO2 atmosphere effectively suppressed abrupt dissociation reaction of Na2CO3, low oxygen partial pressure accelerated vaporization of Na at lower temperature. Interestingly, high partial pressure Of CO2 appeared to hinder phase formation reaction of NaCo2O4 even at the same oxygen partial pressure as that under the aerobic conditions.

    本文言語英語
    ホスト出版物のタイトルProceedings ICT 2003 - 22nd International Conference on Thermoelectrics
    出版社Institute of Electrical and Electronics Engineers Inc.
    ページ227-230
    ページ数4
    ISBN(電子版)078038301X
    DOI
    出版ステータス出版済み - 2003
    イベント22nd International Conference on Thermoelectrics, ICT 2003 - La Grande Motte, フランス
    継続期間: 8月 17 20038月 21 2003

    出版物シリーズ

    名前International Conference on Thermoelectrics, ICT, Proceedings
    2003-January

    その他

    その他22nd International Conference on Thermoelectrics, ICT 2003
    国/地域フランス
    CityLa Grande Motte
    Period8/17/038/21/03

    !!!All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 電子工学および電気工学

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