Relationship between transport properties and phase transformations in mixed-conducting oxides
文献类型：期刊论文
| 作者 | Deng, ZQ; Yang, WS; Liu, W; Chen, CS |
| 刊名 | journal of solid state chemistry
 |
| 出版日期 | 2006-02-01 |
| 卷号 | 179期号:2页码:362-369 |
| 关键词 | mixed-conducting oxides phase transformation order-disorder transition electrical conductivity oxygen permeability high-temperature X-ray diffraction |
| 通讯作者 | 邓增强 |
| 产权排序 | 1;1 |
| 英文摘要 | to elucidate the relationship between transport properties and phase transformations in mixed-conducting oxides, sr0.9ca0.1co0.89fe0.11o3-delta (sccfo) and srcoo3-delta (sco) were chosen as the model materials and have been investigated in detail. oxygen permeation measurements verified that both oxides are well permeable to oxygen at elevated temperatures, e.g., at 900 'c during a cooling procedure, oxygen permeation rates as large as 1.5 and 2.0 ml/min/cm(2) could be obtained with disk-shaped sccfo and sco membranes of thickness 1.5 mm, respectively. but when cooled to critical temperatures, the oxygen permeability of these kinds of oxides diminished sharply, which could be recovered by increasing the temperature again to certain values. abrupt changes on electrical conductivity were also observed for both oxides around the same region of temperature as that of oxygen permeability. as indicated by high-temperature x-ray diffraction and thermal analysis, the sccfo and sco systems undergo phase transformation between a low-temperature orthorhombic brownmillerite structure (b) or a hexagonal 2h-type structure (h) and a high-temperature cubic perovskite structure (c), respectively. the present results suggest the observed abrupt changes in transport properties versus temperature are attributed to such phase transformation, which may be directly associated with the order disorder transition of oxygen vacancies. moreover, compared to the b/c transformation that mainly involves an order-disorder transition on the oxygen sublattice, the h/c one necessarily also involves the cooperative long-range reorganization on the cation sublattice. therefore it occurs at a higher temperature and absorbs more heat quantity than those of b/c transformation. (c) 2005 elsevier inc. all rights reserved. |
| WOS标题词 | science & technology ; physical sciences |
| 类目[WOS] | chemistry, inorganic & nuclear ; chemistry, physical |
| 研究领域[WOS] | chemistry |
| 关键词[WOS] | perovskite-type oxides ; electrical-conductivity ; oxygen permeability ; permeation ; membrane ; brownmillerite ; intergrowth ; transitions ; vacancies ; sr2co2o5 |
| 收录类别 | SCI |
| 原文出处 | true |
| 语种 | 英语 |
| WOS记录号 | WOS:000235282400004 |
| 公开日期 | 2010-11-30 |
| 源URL | [http://159.226.238.44/handle/321008/97667]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 作者单位 | 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China 2.Univ Sci & Technol China, Dept Mat Sci & Engn, Lab Adv Funct Mat & Devices, Hefei 230026, Anhui, Peoples R China |
| 推荐引用方式 GB/T 7714 | Deng, ZQ,Yang, WS,Liu, W,et al. Relationship between transport properties and phase transformations in mixed-conducting oxides[J]. journal of solid state chemistry,2006,179(2):362-369. |
| APA | Deng, ZQ,Yang, WS,Liu, W,&Chen, CS.(2006).Relationship between transport properties and phase transformations in mixed-conducting oxides.journal of solid state chemistry,179(2),362-369. |
| MLA | Deng, ZQ,et al."Relationship between transport properties and phase transformations in mixed-conducting oxides".journal of solid state chemistry 179.2(2006):362-369. |
入库方式： OAI收割
来源：大连化学物理研究所
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