Oxygen permeation studies of Sr{sub 4}Fe{sub 6{minus}x}Co{sub x}O{sub 13}

Journal Article · Thu Apr 01 04:00:00 EST 1999 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(99)00082-3· OSTI ID:684407

Armstrong, T; Guggilla, S; Manthiram, A ^[1]

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1. Univ. of Texas, Austin, TX (United States). Texas Materials Inst.

The oxygen permeation properties of Sr{sub 4}Fe{sub 6{minus}x}Co{sub x}O{sub 13} have been studied for 0 {le} x {le} 1.8. Samples with x > 1.5 consist of the perovskite phase SrFe{sub 1{minus}x}Co{sub x}O{sub 3{minus}{delta}} and the spinel phase Co{sub 3{minus}x}Fe{sub x}O{sub 4} in addition to the Sr{sub 4}Fe{sub 6}O{sub 13}-type intergrowth phase. The total conductivity and the oxygen flux increase with increasing x. Although the oxygen flux in the undoped Sr{sub 4}Fe{sub 6}O{sub 13} remains constant, that in the x {ge} 1.5 samples decreases upon cycling the permeation measurements. The decrease in oxygen flux on cycling is attributed to oxygen loss and changes in phase compositions at low oxygen partial pressures as indicated by thermogravimetric analysis.

• OSTI ID: 684407
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 6 Vol. 34; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ATOM TRANSPORT
CHEMICAL COMPOSITION
COBALT OXIDES
IONIC CONDUCTIVITY
IRON OXIDES
OXYGEN
STRONTIUM OXIDES
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION