中国科学院大连化学物理研究所机构知识库
Advanced  
DICP OpenIR  > 中国科学院大连化学物理研究所  > 期刊论文
题名: Relationship between transport properties and phase transformations in mixed-conducting oxides
作者: Deng, ZQ;  Yang, WS;  Liu, W;  Chen, CS
通讯作者: 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
发表日期: 2006-02-01
DOI: 10.1016/j.jssc.2005.10.027
卷: 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
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.
关键词[WOS]: PEROVSKITE-TYPE OXIDES ;  ELECTRICAL-CONDUCTIVITY ;  OXYGEN PERMEABILITY ;  PERMEATION ;  MEMBRANE ;  BROWNMILLERITE ;  INTERGROWTH ;  TRANSITIONS ;  VACANCIES ;  SR2CO2O5
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000235282400004
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/97667
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

Files in This Item:

There are no files associated with this item.


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

Recommended Citation:
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.
Service
 Recommend this item
 Sava as my favorate item
 Show this item's statistics
 Export Endnote File
Google Scholar
 Similar articles in Google Scholar
 [Deng, ZQ]'s Articles
 [Yang, WS]'s Articles
 [Liu, W]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [Deng, ZQ]‘s Articles
 [Yang, WS]‘s Articles
 [Liu, W]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
  Add to CiteULike  Add to Connotea  Add to Del.icio.us  Add to Digg  Add to Reddit 
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Powered by CSpace