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.

Solution combustion synthesis of (Ni,Fe)Cr2O4 pigments: Effect of post-synthesis thermal treatments

“…The present research is aimed at studying the effect of post-synthesis calcination temperature (T c ) and kiln atmosphere on the evolution of spinel-type pigments Ni 1−Ψ Fe Ψ Cr 2 O 4 (0.0 ≤ Ψ ≤ 1.0) synthesized by Solution Combustion Synthesis, using urea as fuel. As reported, there are relevant studies which apply a calcination process after combustion [1,3,21,22], but little attention has been paid to this stage when observing its effect on the as-synthesized product. In fact, there is a growing uncertainty about the changes undertaken in pigment characteristics when it is added to a glaze until the very first moment in which it starts to melt.…”