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

Journal Article · Sat Apr 01 00:00:00 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]

---

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, Vol. 78, Issue 4; Other Information: PBD: Apr 1995
• Country of Publication: United States
• Language: English

Related Subjects

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