Chemical compatibility between strontium-doped lanthanum manganite and yttria-stabilized zirconia

Journal Article · Fri Mar 31 23:00:00 EST 1995 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1995.tb08416.x· OSTI ID:82585

Stochniol, G; Syskakis, E; Naoumidis, A ^[1]

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1. Research Center Juelich GmbH (Germany). Inst. for Materials in Energy Systems

Equimolar powder mixtures and multilayer pellets of single-phase Sr-doped lanthanum manganite perovskite materials La{sub y{minus}x}Sr{sub x}MnO{sub 3} with La content y = 1 and 0.95 and Sr content 0 {<=} x {<=} 0.5 were annealed in air with 8 mol% Y{sub 2}O{sub 3}ZrO{sub 2} at 1470 K up to 400 h and at 1670 K up to 200 h. X-ray diffraction and electron probe microanalysis confirmed the formation of La{sub 2}Zr{sub 2}O{sub 7} or SrZrO{sub 3} depending on the composition of the perovskites. No reaction products could be detected for La{sub 0.95 {minus}x}Sr{sub x}MnO{sub 3} with 0.2 {<=} x {<=} 0.4 after annealing for 400 h at 1470 K, and for the perovskite La{sub 0.65}Sr{sub 0.3}MnO{sub 3} even after annealing for 200 h at 1,670 K. The results demonstrate the improved chemical compatibility of La-deficient perovskites against reaction with zirconia and can provide a basis for the selection of a sufficiently chemically stable material for the air electrode of solid oxide fuel cells.

• Sponsoring Organization: USDOE
• OSTI ID: 82585
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 4 Vol. 78; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ANNEALING
CHEMICAL REACTION KINETICS
COMPATIBILITY
DIFFERENTIAL THERMAL ANALYSIS
ELECTRON MICROPROBE ANALYSIS
LANTHANUM OXIDES
MANGANESE OXIDES
PEROVSKITES
POWDERS
SCANNING ELECTRON MICROSCOPY
SOLID ELECTROLYTE FUEL CELLS
STRONTIUM OXIDES
SURFACE AREA
X-RAY DIFFRACTION
YTTRIUM OXIDES
ZIRCONIUM OXIDES