TITLE

Synthesis of Sr-doped LaCrO powders by combustion method

AUTHOR(S)
da Silva, Adney; Castro, Guilherme; Souza, Mariana
PUB. DATE
July 2012
SOURCE
Journal of Thermal Analysis & Calorimetry;Jul2012, Vol. 109 Issue 1, p33
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Lanthanum strontium chromite (LSC) powders were synthesized by the combustion method, using five different fuels (urea, glycine, ethylene glycol, α-alanine, and citric acid). The ignition of the reagent mixture with urea takes a longer time, and more gases are released by combustion. A calcination step is essential for a good crystallization of the perovskite phase. X-ray diffraction patterns showed formation of perovskite phase and a small amount of SrCrO for the sample synthesized with urea after calcination. The crystallite sizes are in the range of 23-33 nm. Scanning electron microscopy revealed the porosity of the powders and the presence of agglomerates, formed by fine particles of different shapes. Thermogravimetric analysis showed a large mass loss for the sample synthesized with citric acid, probably caused by the absence of ignition, with primary polymerization of the precursor reagents.
ACCESSION #
76447149

 

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