Role of Perovskite Phase on the Oxygen Permeation Properties of the Sr[sub 4]Fe[sub 6−x]Co[sub x]O[sub 13+δ] System
- 1 January 2000
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 147 (2) , 435-438
- https://doi.org/10.1149/1.1393214
Abstract
Oxygen permeation measurements of the system with 0 ≤ ≤ 2.0 are presented. samples prepared by solid‐state method consist of single‐phase for 0 ≤ < 1.5 and a three‐phase mixture composed of the intergrowth phase with < 1.5, the perovskite phase , and the spinel phase for 1.5 ≤ ≤ 2.0. On the other hand, samples prepared by a sol‐gel method consist of single‐phase for the entire 0 ≤ ≤ 2.0. The composition consisting of the three‐phase mixture exhibits oxygen permeation fluxes one order of magnitude higher than the single‐phase . The higher oxygen permeation rate of the sample consisting of three phases is due to the perovskite phase since single‐phase perovskite permeates oxygen two orders of magnitude higher than the single‐phase . While the single‐phase samples show stable oxygen permeation rates as a function of time, the samples consisting of the three‐phase mixture show a decrease in oxygen permeation with time. © 2000 The Electrochemical Society. All rights reserved.Keywords
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