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Redox characteristics variations in the cation-ordered perovskite oxides BaLnMn(2)O(5+delta) (Ln = Y, Gd, Nd, and La) and Ca2Al1-xGaxMnO5+delta (0 <= x <= 1)
| Title: | Redox characteristics variations in the cation-ordered perovskite oxides BaLnMn(2)O(5+delta) (Ln = Y, Gd, Nd, and La) and Ca2Al1-xGaxMnO5+delta (0 <= x <= 1) |
| Authors: | Motohashi, Teruki Browse this author →KAKEN DB | | Kimura, Makoto Browse this author | | Inayoshi, Takeru Browse this author | | Ueda, Taku Browse this author | | Masubuchi, Yuji Browse this author →KAKEN DB | | Kikkawa, Shinichi Browse this author →KAKEN DB |
| Issue Date: | 2015 |
| Publisher: | Royal Society of Chemistry (RSC) |
| Journal Title: | Dalton transactions |
| Volume: | 44 |
| Issue: | 23 |
| Start Page: | 10746 |
| End Page: | 10752 |
| Publisher DOI: | 10.1039/c4dt03863k |
| PMID: | 25688832 |
| Abstract: | Two series of manganese-based oxygen storage materials, BaLnMn(2)O(5+delta) (Ln = Y, Gd, Nd, and La) and Ca2Al1-xGaxMnO5+delta (0 <= x <= 1), were synthesized and characterized to clarify cationic substitution effects on the oxygen intake/release behaviors of these materials. The thermogravimetric data revealed that the isovalent substitutions neighboring the active sites for oxygen intake/release are very effective. For BaLnMn(2)O(5+)delta, fully-reduced delta approximate to 0 products with larger Ln ions showed oxygen intake starting at lower temperatures in flowing O-2 gas, resulting in a systematic relationship between the onset temperature and the ionic radius of Ln(3+). Furthermore, the delta vs. P(O-2) plots at 700 degrees C indicated a systematic trend: the larger the ionic size of Ln(3+) is, the larger oxygen contents the Ln-products exhibit. For Ca2Al1-x-GaxMnO5+delta , on the other hand, the temperature-induced oxygen intake/release characteristics appeared to be influenced by Ga-for-Al substitution, where the onset temperatures of oxygen release (upon heating) and oxygen intake (upon cooling) are decreased with the increasing Ga content (x). |
| Type: | article (author version) |
| URI: | http://hdl.handle.net/2115/62253 |
| 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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