Journal ArticleDOI
Electronic Conductivity, Seebeck Coefficient, and Defect Structure of La1-xSrxFeO3 (x=0.l, 0.25)
TLDR
In this paper, the defect structure of La1-xSrxFeO3 was determined by considering the imperfections SrLa, Vo, FeFe, and Fe′Fe in the lower range.Abstract:
The electrical conductivity and Seebeck coefficients of La1-xSrxFeO3 (x=0.1, 0.25) were measured as a function of oxygen partial pressure, PO2, at T=900° to 1300°C. The electrical conduction was p type in the higher PO2 range, and n type in the lower PO2 range. The Seebeck coefficient indicated that the conduction was due to electron hopping between Fe×Fe and FeFe, in the higher PO2 range and electron hopping between Fe′Fe and Fe×Fe in the lower range. The carrier concentrations were calculated from the values of electrical conductivity and Seebeck coefficient. From the PO2 dependences of the carrier concentrations, the defect structure of La1-xSrxFeO3 was determined. It was found that the electrical properties can be described by considering the imperfections SrLa, Vo, FeFe, and Fe′Fe.read more
Citations
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Factors Governing Oxygen Reduction in Solid Oxide Fuel Cell Cathodes
TL;DR: These advances have led to dozens of active SOFC development programs in both stationary and mobile power and contributed to commercialization or development in a number of related technologies, including gas sensors, solid-state electrolysis devices, and iontransport membranes for gas separation and partial oxidation.
Journal ArticleDOI
Progress in material selection for solid oxide fuel cell technology: A review
TL;DR: In this paper, the authors provide a comprehensive review with respect to the structure, chemistry, design and selection of materials, underlying mechanisms, and performance of each SOFC component, and it opens up the future directions towards pursuing SOFC research.
Journal ArticleDOI
Structure and electrical properties of La1−xSrxCo1−yFeyO3. Part 1. The system La0.8Sr0.2Co1−yFeyO3
TL;DR: In this article, the electrical conductivity and Seebeck coefficient as a function of the Co Fe ratio and temperature were investigated in the La0.8Sr0.2Co1−yFeyO3 with 0 ≤ y ≤ 1.
Journal ArticleDOI
Structure and electrical properties of La1 − xSrxCo1 − yFeyO3. Part 2. The system La1 − xSrxCo0.2Fe0.8O3
TL;DR: In this paper, a semi-empirical model was developed which took into account the thermally activated disproportionation of Co 3+ ions into Co 4+ and Co 2+ pairs, and the ionic compensation of oxygen vacancies formed at high temperatures.
Journal ArticleDOI
Perovskite-type oxides as oxygen electrodes for high temperature oxide fuel cells
TL;DR: Polarization and electrical conductivity measurements were made at 800°C in open air using the perovskite-type oxides La 1− x Sr x MO 3 (M Cr, Mn, Fe, Co) sputtered on ytteia stabilized zirconia electrolyte.
References
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Journal ArticleDOI
Localized level hopping transport in La(Sr)Cr O 3
D. P. Karim,A. T. Aldred +1 more
TL;DR: In this article, high-temperature measurements have been performed on the electronically conducting oxide system and the magnetic susceptibility was Curie-Weiss-like between 600 and 1100 K with an effective moment that decreased with an increase in strontium concentration.
Journal ArticleDOI
Halbleitereigenschaften des Lanthankobaltit
P. Gerthsen,K. H. Härdtl +1 more
TL;DR: In this article, the LaCoO3-Proben wurden über einen größeren Temperaturbereich gemessen, nach dem die Transporteigenschaften durch thermisch aktivierte Platzwechsel der Ladungsträger zwischen benachbarten lokalisierten Elektronenniveaus bestimmt sind.
Journal ArticleDOI
Electrochemical Degradation of Ceramic Electrodes
TL;DR: In this article, the interior oxygen chemical potentials in the interior of ceramic electrodes with ion blocking interfaces indicate that phase changes and/or decomposition will occur as a result of dc polarization.