Structure and property relationship in the mixed-conducting Sr-Fe-Co-O system.

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Mixed-conducting ceramic oxides have potential uses in high-temperature electrochemical applications such as solid oxide fuel cells, advanced batteries, sensors, and oxygen-permeable membranes. The Sr-Fe-Co-O system combines high electronic/ionic conductivity with appreciable oxygen permeability at elevated temperatures. Dense ceramic membranes made of this material can be used to separate high-purity oxygen from air without the need for external electrical circuitry, or to partially oxidize methane to produce syngas. Samples of Sr{sub 2}Fe{sub 3{minus}x}Co{sub x}O{sub y} (with x = 0, 0.6, 1.0, and 1.4) were prepared by solid-state reaction in atmospheres with various oxygen partial pressures (pO{sub 2}) and were characterized by ... continued below

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15 p.

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Ma, B. May 18, 1998.

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Mixed-conducting ceramic oxides have potential uses in high-temperature electrochemical applications such as solid oxide fuel cells, advanced batteries, sensors, and oxygen-permeable membranes. The Sr-Fe-Co-O system combines high electronic/ionic conductivity with appreciable oxygen permeability at elevated temperatures. Dense ceramic membranes made of this material can be used to separate high-purity oxygen from air without the need for external electrical circuitry, or to partially oxidize methane to produce syngas. Samples of Sr{sub 2}Fe{sub 3{minus}x}Co{sub x}O{sub y} (with x = 0, 0.6, 1.0, and 1.4) were prepared by solid-state reaction in atmospheres with various oxygen partial pressures (pO{sub 2}) and were characterized by X-ray diffraction, scanning electron microscopy, and electrical conductivity measurements. Phase components of the samples are dependent on cobalt concentration and synthesis pO{sub 2}. Total conductivity increases with increasing temperature and cobalt content in the material. Higher ionic transference numbers have been observed in samples with lower cobalt contents. Current-voltage characteristics determined in a gas-tight cell indicate that a bulk effect, rather than a surface exchange effect, is the main limiting factor for oxygen permeation through membranes made of Sr{sub 2}Fe{sub 2}CoO{sub y}. Oxygen permeability measurements at various temperatures showed that oxygen permeability increases with increasing temperature, as expected. At 900 C, an oxygen permeation flux of 2.5 scc{center_dot}cm{sup {minus}2}{center_dot}min{sup {minus}1} was obtained for a Sr{sub 2}Fe{sub 2}CoO{sub y} disk of 2.9 mm thickness.

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15 p.

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OSTI as DE00010561

Medium: P; Size: 15 pages

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  • 100th Annual Meeting of the American Ceramic Society, Cincinnati, OH (US), 05/03/1998--05/06/1998

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  • Report No.: ANL/ET/CP-95329
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 10561
  • Archival Resource Key: ark:/67531/metadc628349

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  • May 18, 1998

Added to The UNT Digital Library

  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 3:11 p.m.

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Ma, B. Structure and property relationship in the mixed-conducting Sr-Fe-Co-O system., article, May 18, 1998; Illinois. (digital.library.unt.edu/ark:/67531/metadc628349/: accessed November 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.