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Synthesis, thermal stability, and oxygen intake/release characteristics of YBa(Co1−xAlx)4O7+δ
| Title: | Synthesis, thermal stability, and oxygen intake/release characteristics of YBa(Co1−xAlx)4O7+δ |
| Authors: | Komiyama, Takafumi Browse this author | | Motohashi, Teruki Browse this author | | Masubuchi, Yuji Browse this author | | Kikkawa, Shinichi Browse this author |
| Keywords: | Oxides | | Chemical synthesis | | Thermogravimetric analysis (TGA) | | Diffusion | | phase transactions |
| Issue Date: | Oct-2010 |
| Publisher: | Elsevier |
| Journal Title: | Materials Research Bulletin |
| Volume: | 45 |
| Issue: | 10 |
| Start Page: | 1527 |
| End Page: | 1532 |
| Publisher DOI: | 10.1016/j.materresbull.2010.06.031 |
| Abstract: | 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. |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/43821 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 本橋 輝樹
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