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

Abstract

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.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
755853
Report Number(s):
ANL/ET/CP-100462
TRN: AH200021%%76
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 102nd Annual Meeting of the American Ceramic Society, St. Louis, MO (US), 04/30/2000--05/03/2000; Other Information: PBD: 18 May 2000
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 03 NATURAL GAS; STRONTIUM OXIDES; IRON OXIDES; COBALT OXIDES; ELECTRIC CONDUCTIVITY; IONIC CONDUCTIVITY; PERMEABILITY; PHASE TRANSFORMATIONS; TEMPERATURE DEPENDENCE

Citation Formats

Ma, B., Victory, N. I., Balachandran, U., Mitchell, B. J., and Richardson, J. W., Jr. Study of the mixed-conducting SrFeCo{sub 0.5}O{sub y} system. United States: N. p., 2000. Web.
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. United States.
Ma, B., Victory, N. I., Balachandran, U., Mitchell, B. J., and Richardson, J. W., Jr. Thu . "Study of the mixed-conducting SrFeCo{sub 0.5}O{sub y} system". United States. https://www.osti.gov/servlets/purl/755853.
@article{osti_755853,
title = {Study of the mixed-conducting SrFeCo{sub 0.5}O{sub y} system},
author = {Ma, B. and Victory, N. I. and Balachandran, U. and Mitchell, B. J. and Richardson, J. W., Jr.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Conference:
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