Combustion Synthesis of LSM Powders from a Precursor Solution with Mixed Fuels

Abstract:

For the combustion synthesis of strontium doped lanthanum manganite (LSM), different fuels can be used influencing the phase formation and also the powder morphology. Both are important features that can improve the material performance when used in a solid oxide fuel cell cathode. Urea and sucrose are fuels used to synthesize distinct LSM powders, thus the purpose of this work was to mix these fuels in order to obtain nanocrystalline LSM powders with a differentiated morphology, more convenient for the desired application. After calcination at 750°C for 3 hours the powder generated a pure phase LSM X-ray diffraction pattern and the micrographs taken in the transmission and scanning electron microscopes revealed a very peculiar morphology with specific surface area (BET) of 13 m²/g. Calcination led to a single phase and more crystalline material but showed no influence in the powder morphology.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 1329-1333
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.1329
• Online since: August 2012
• Authors: Diego Pereira Tarragó, Célia de Fraga Malfatti, Vânia Caldas de Sousa
• Keywords: Combustion Synthesis, Solid Oxide Fuel Cell (SOFC), Strontium Doped Lanthanum Manganite, Sucrose, Urea

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