Crystal structure, oxygen permeability and stability of Ba0.5Sr0.5Co0.8Fe0.1M0.1O3-δ (M = Fe, Cr, Mn, Zr) oxygen-permeable membranes

被引：30

作者：

Lu, H ^{[1
]}

Tong, JH ^{[1
]}

Deng, ZQ ^{[1
]}

Cong, Y ^{[1
]}

Yang, WS ^{[1
]}

机构：

[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

来源：

MATERIALS RESEARCH BULLETIN | 2006年 / 41卷 / 04期

基金：

中国国家自然科学基金;

关键词：

ceramics membrane; oxygen permeability; stability; X-ray diffraction; crystal structure;

D O I：

10.1016/j.materresbull.2005.10.017

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Oxygen-permeable ceramic membrane materials of the Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCFO) and partially Fe-substituted Ba0.5Sr0.5Co0.8Fe0.1M0.1O3-delta (M = Cr, Mn, Zr) were synthesized by solid-state reaction method. These materials possess purely cubic perovskite structure with the exception of Ba0.5Sr0.5C0.8Fe0.1M0.1O3-delta (M = Mn, Zr), in which minor impufities exist. Oxygen permeability across these dense membrane disks were measured under an air[He oxygen partial pressure gradient in the temperature range of 973-1123 K. The results demonstrated that the oxygen permeation fluxes of the Ba0.5Sr0.5Co0.8Fe0.1M0.1O3-delta (M = Fe, Cr, Mn, Zr) membranes increased in the following order: Fe (BSCFO) > Cr > Zr > Mn. The corresponding activation energies for oxygen permeation of Ba0.5Sr0.5Co0.8Fe0.1M0.1O3-delta (M = Fe, Cr, Zr) membranes were calculated to be similar (53 +/- 4 kJ/mol), which was remarkably lower than that (99 +/- 3 kJ/mol) of Ba0.5Sr0.5Co0.8Fe0.1M0.1O3-delta (M = Mn) membrane. In addition, good oxygen permeation stability of the Ba0.5Sr0.5Co0.8Fe0.1M0.1O3-delta (M = Cr) membrane was achieved at the temperature lower than 1123 K. The X-ray diffraction (XRD) and differential thermal analysis (DTA) experiments showed that the structural stability of BSCFO could be significantly improved when Fe ions in the BSCFO material were partially substituted by Cr, Mn or Zr ions. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：683 / 689

页数：7

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