Crystal structure, oxygen permeability and stability of Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.1}M{sub 0.1}O{sub 3-{delta}} (M = Fe, Cr, Mn, Zr) oxygen-permeable membranes

Journal Article · Thu Apr 13 00:00:00 EDT 2006 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2005.10.017· OSTI ID:20891654

Hui, Lu ^[1]; Jianhua, Tong ^[1]; Zengqiang, Deng ^[1]; You, Cong ^[1]; Weishen, Yang ^[1]

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1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, P.O. Box 110, Dalian 116023 (China)

Oxygen-permeable ceramic membrane materials of the Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.2}O{sub 3-{delta}} (BSCFO) and partially Fe-substituted Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.1}M{sub 0.1}O{sub 3-{delta}} (M = Cr, Mn, Zr) were synthesized by solid-state reaction method. These materials possess purely cubic perovskite structure with the exception of Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.1}M{sub 0.1}O{sub 3-{delta}} (M = Mn, Zr), in which minor impurities 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 Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.1}M{sub 0.1}O{sub 3-{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 Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.1}M{sub 0.1}O{sub 3-{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 Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.1}M{sub 0.1}O{sub 3-{delta}} (M = Mn) membrane. In addition, good oxygen permeation stability of the Ba{sub 0.5}Sr{sub 0.5}Co{sub 0.8}Fe{sub 0.1}M{sub 0.1}O{sub 3-{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.

• OSTI ID: 20891654
• Journal Information: Materials Research Bulletin, Vol. 41, Issue 4; Other Information: DOI: 10.1016/j.materresbull.2005.10.017; PII: S0025-5408(05)00403-4; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
BARIUM OXIDES
CERAMICS
COBALT OXIDES
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
IMPURITIES
IRON IONS
IRON OXIDES
MEMBRANES
PARTIAL PRESSURE
PERMEABILITY
PEROVSKITE
STABILITY
STRONTIUM OXIDES
X-RAY DIFFRACTION
ZIRCONIUM IONS