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Synthesis, thermal stability, and oxygen intake/release characteristics of YBa(Co1−xAlx)4O7+δ

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タイトル: Synthesis, thermal stability, and oxygen intake/release characteristics of YBa(Co1−xAlx)4O7+δ
著者: Komiyama, Takafumi 著作を一覧する
Motohashi, Teruki 著作を一覧する
Masubuchi, Yuji 著作を一覧する
Kikkawa, Shinichi 著作を一覧する
キーワード: Oxides
Chemical synthesis
Thermogravimetric analysis (TGA)
Diffusion
phase transactions
発行日: 2010年10月
出版者: Elsevier
誌名: Materials Research Bulletin
巻: 45
号: 10
開始ページ: 1527
終了ページ: 1532
出版社 DOI: 10.1016/j.materresbull.2010.06.031
抄録: The YBaCo4O7+d (Y-114) phase has recently attracted interests as a potential oxygen storagematerial due to its oxygen intake/release capability at 200–400 8C. Nevertheless, thermal instability of Y-114 has been an obstacle for future applications, since this compound immediately starts to decompose when the sample is heated at 700–800 8C in oxygen-rich atmosphere. Here we demonstrate that Al-for-Co substitution in Y-114 drastically enhances the thermal stability. Substituting only 10 at.% of aluminum for cobalt in Y-114 essentially suppresses the decomposition reaction seen at 700–800 8C, while well retaining its remarkable oxygen intake/release capability at 200–400 8C. It is also revealed that the addition of aluminum effectively reduces the particle size. The Al-substituted Y-114 products exhibit superior oxygen intake/release response to the Al-free products upon switching the atmosphere between O2 and N2.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/43821
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 本橋 輝樹

 

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