Study of the mixed-conducting SrFeCo{sub 0.5}O{sub y} system

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Mixed-conducting Sr-Fe-Co oxides have potential applications in dense ceramic membranes for high-purity oxygen separation and/or methane conversion to produce syngas (CO + H{sub 2}), because of their combined high electronic/ionic conductivity and significant oxygen permeability. SrFeCo{sub 0.5}O{sub y} has been synthesized by the solid-state reaction method. Conductivities were measured at elevated temperatures in various gas environments and rose with increasing temperature and increasing oxygen partial pressure (pO{sub 2}) in the surrounding environment. Neutron powder diffraction experiments revealed that in a high pO{sub 2} environment the SrFeCo{sub 0.5}O{sub y} material consists of three different phases. The relative concentration of each component ... continued below

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11 p.

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Ma, B.; Victory, N. I.; Balachandran, U.; Mitchell, B. J. & Richardson, J. W., Jr. May 18, 2000.

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Mixed-conducting Sr-Fe-Co oxides have potential applications in dense ceramic membranes for high-purity oxygen separation and/or methane conversion to produce syngas (CO + H{sub 2}), because of their combined high electronic/ionic conductivity and significant oxygen permeability. SrFeCo{sub 0.5}O{sub y} has been synthesized by the solid-state reaction method. Conductivities were measured at elevated temperatures in various gas environments and rose with increasing temperature and increasing oxygen partial pressure (pO{sub 2}) in the surrounding environment. Neutron powder diffraction experiments revealed that in a high pO{sub 2} environment the SrFeCo{sub 0.5}O{sub y} material consists of three different phases. The relative concentration of each component phase is dependent on temperature and pO{sub 2} in the surrounding environment. In air, Sr{sub 2}(Fe,Co){sub 3}O{sub y} (236 phase) is the majority phase and consists of >75wt.% of the total, while the perovskite and rocksalt phases account for {approx}20wt.% and <5 wt.%, respectively. However, in a reducing environment, the 236 phase decomposes and converts to perovskite and rocksalt phase at high temperature. In an environment of pO{sub 2} < 10{sup {minus}12.2} atm, the 236 phase is completely converted into perovskite (brownmillerite) and rocksalt phases.

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11 p.

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OSTI as DE00755853

Medium: P; Size: 11 pages

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  • 102nd Annual Meeting of the American Ceramic Society, St. Louis, MO (US), 04/30/2000--05/03/2000

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  • Report No.: ANL/ET/CP-100462
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 755853
  • Archival Resource Key: ark:/67531/metadc708866

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  • May 18, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 6, 2017, 7:46 p.m.

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Ma, B.; Victory, N. I.; Balachandran, U.; Mitchell, B. J. & Richardson, J. W., Jr. Study of the mixed-conducting SrFeCo{sub 0.5}O{sub y} system, article, May 18, 2000; Illinois. (digital.library.unt.edu/ark:/67531/metadc708866/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.