Role of perovskite phase on the oxygen permeation properties of the Sr{sub 4}Fe{sub 6{minus}x}Co{sub x}O{sub 13+{delta}} system
Journal Article
·
· Journal of the Electrochemical Society
Oxygen permeation measurements of the Sr{sub 4}Fe{sub 6{minus}x}Co{sub x}O{sub 13+{delta}} (A) system with 0 {le} x {le}2.0 are presented. The A samples prepared by solid-state method consist of single-phase A for 0 {le} x < 1.5 and a three-phase mixture composed of the intergrowth phase A with x < 1.5, the perovskite phase SrFe{sub 1{minus}x}Co{sub x}O{sub 3{minus}{delta}}, and the spinel phase Co{sub 3{minus}x}Fe{sub x}O{sub 4} for 1.5 {le} x {le} 2.0. On the other hand, A samples prepared by a sol-gel method consist of single-phase a for the entire 0 {le} x {le} 2.0. The Sr{sub 4}Fe{sub 4}Co{sub 2}O{sub 13+{delta}} (B) composition consisting of the three-phase mixture exhibits oxygen permeation fluxes one order of magnitude higher than the single-phase B. The higher oxygen permeation rate of the sample consisting of three phases is due to the perovskite phase since single-phase perovskite SrFe{sub 0.75}Co{sub 0.25}O{sub 3{minus}{delta}} permeates oxygen two orders of magnitude higher than the single-phase B. While the single-phase A samples show stable oxygen permeation rates as a function of time, The A samples consisting of the three-phase mixture show a decrease in oxygen permeation with time.
- Research Organization:
- Univ. of Texas, Austin, TX (US)
- OSTI ID:
- 20023330
- Journal Information:
- Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 147; ISSN 0013-4651; ISSN JESOAN
- Country of Publication:
- United States
- Language:
- English
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