Crystal chemical characterization of the mixed conductor Sr(Fe,Co){sub 1.5}O{sub y} exhibiting unusually high oxygen permeability

Journal Article · Thu May 01 04:00:00 EDT 1997 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1837631· OSTI ID:511931

Guggilla, S; Manthiram, A ^[1]

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1. Univ. of Texas, Austin, TX (United States). Center for Materials Science and Engineering

The crystal chemistry of a recently reported mixed conductor SrFeCo{sub 0.5}O{sub y}, exhibiting unusually high oxygen permeability, has been characterized by systematically investigating the Sr(Fe, Co){sub 1.5}O{sub y} system. The samples belong to the general stoichiometry Sr{sub 4}Fe{sub 6{minus}x}Co{sub x}O{sub 13+{delta}} and have an orthorhombic, intergrowth structure isotypic with Sr{sub 4}Fe{sub 6}O{sub 13} for 0 {le} x {le} 1.5. While the intergrowth phase Sr{sub 4}Fe{sub 6{minus}x}Co{sub x}O{sub 13+{delta}} and the perovskite phase Sr(Fe, Co)O{sub 3{minus}{delta}} coexist along with CoO impurity for 1.7 {le} x {le} 2.1, the perovskite phase is formed along with CoO impurity for x = 2.4. In the single-phase region with 0 {le} x {le} 1.5, the oxygen content decreases, and the total conductivity increases with x. The occurrence of unusually high oxide-ion conductivity is explained on the basis of crystal chemistry.

• Sponsoring Organization: Welch (Robert A.) Foundation, Houston, TX (United States)
• OSTI ID: 511931
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 144; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

30 DIRECT ENERGY CONVERSION
36 MATERIALS SCIENCE
COBALT OXIDES
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
IRON OXIDES
OXYGEN
PERMEABILITY
PHASE STUDIES
SOLID ELECTROLYTE FUEL CELLS
STRONTIUM OXIDES