Preparation, properties, and reactivity of lanthanum strontium ferrite as an intermediate temperature SOFC cathode

Lanthanum strontium ferrite is a promising cathode material especially because of its chemical stability and thermal expansion compatibility with respect to zirconia-based electrolyte materials. La 0.80 Sr 0.20 FeO 3 is synthesized by the gel-combustion technique using citric acid as the fuel. A pha...

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Bibliographic Details
Published in:Journal of materials science 2013-10, Vol.48 (19), p.6597-6604
Main Authors: Chavan, S. V., Singh, R. N.
Format: Article
Language:English
Subjects:
Cathodes
Characterization and Evaluation of Materials
Chemistry and Materials Science
Citric acid
Classical Mechanics
Corrosion resistance
Crystallography and Scattering Methods
Electric properties
Electrical conductivity
Electrical resistivity
Electrode materials
Electrolytes
Ferrite
Ferrites
Iron compounds
Lanthanum
Materials Science
Organic chemistry
Perovskite structure
Perovskites
Polymer Sciences
Powders
Scandium oxides
Sintering
Sintering (powder metallurgy)
Solid Mechanics
Stability
Strontium
Tape casting
Thermal expansion
Thermal properties
Zirconium dioxide
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Summary:Lanthanum strontium ferrite is a promising cathode material especially because of its chemical stability and thermal expansion compatibility with respect to zirconia-based electrolyte materials. La 0.80 Sr 0.20 FeO 3 is synthesized by the gel-combustion technique using citric acid as the fuel. A phase-pure powder belonging to the perovskite structure is obtained at lower calcination temperature of 850 °C. The powders are tape-cast into tapes and detailed sintering studies are carried out between 1100 and 1450 °C and for different sintering durations. A thermal expansion coefficient of 11.65 ppm/°C from RT-1000 °C is measured for the sample sintered at 1450 °C for 6 h. The DC electrical conductivity is also measured for a number of samples having different sintered densities. Further, investigations on the chemical stability are demonstrated between this cathode and a scandia-doped zirconia electrolyte prepared in our laboratory.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-013-7456-9