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Relationship between transport properties and phase transformations in mixed-conducting oxides
Deng, ZQ; Yang, WS; Liu, W; Chen, CS; Deng ZQ(邓增强); Deng ZQ(邓增强)
关键词Mixed-conducting Oxides Phase Transformation Order-disorder Transition Electrical Conductivity Oxygen Permeability High-temperature X-ray Diffraction
刊名JOURNAL OF SOLID STATE CHEMISTRY
2006-02-01
DOI10.1016/j.jssc.2005.10.027
179期:2页:362-369
收录类别SCI
文章类型Article
部门归属5
项目归属504
产权排名1;1
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
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.
语种英语
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WOS记录号WOS:000235282400004
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被引频次:95[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/97667
专题中国科学院大连化学物理研究所
通讯作者Deng ZQ(邓增强); Deng ZQ(邓增强)
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
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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,邓增强,&邓增强.(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.
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