Thermodynamics and stability of the mixed-conducting Sr-Fe-Co-O 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. We studied the crystal structure and microstructure of the system in X-ray diffraction experiments and by using scanning electron microscopy, respectively. Thermogravimetric analysis was conducted on the SrFeCo{sub 0.5}O{sub x} sample in environments of various oxygen partial pressures (pO{sub 2}). Conductivity increased while weight decreased with increasing temperature. Activation energy decreased while conductivity increased with increasing pO{sub 2}. The pO{sub 2}-dependent conducting behavior of the ... continued below

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13 p.

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Ma, B. April 28, 1999.

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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. We studied the crystal structure and microstructure of the system in X-ray diffraction experiments and by using scanning electron microscopy, respectively. Thermogravimetric analysis was conducted on the SrFeCo{sub 0.5}O{sub x} sample in environments of various oxygen partial pressures (pO{sub 2}). Conductivity increased while weight decreased with increasing temperature. Activation energy decreased while conductivity increased with increasing pO{sub 2}. The pO{sub 2}-dependent conducting behavior of the SrFeCo{sub 0.5}O{sub x} system can be understood by considering the trivalent-to-divalent transition of transition-metal ions.

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13 p.

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OSTI as DE00011173

Medium: P; Size: 13 pages

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  • American Ceramic Society 101st Annual Meeting, Indianapolis, IN (US), 04/25/1999--04/28/1999

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  • Report No.: ANL/ET/CP-97895
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 11173
  • Archival Resource Key: ark:/67531/metadc626518

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  • April 28, 1999

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  • June 16, 2015, 7:43 a.m.

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  • April 7, 2017, 1:18 p.m.

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Ma, B. Thermodynamics and stability of the mixed-conducting Sr-Fe-Co-O system., article, April 28, 1999; Illinois. (digital.library.unt.edu/ark:/67531/metadc626518/: accessed September 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.