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Synthesis of LaCrO3 and La0.9Ca0.1CrO3 by Modified Glycine Nitrate Process
A. Bonet, N. Travitzky, P. Greil
University of Erlangen-Nuremberg, Department of Materials Science (Glass and Ceramics), Martensstr. 5, D-91058 Erlangen, Germany
received October 11, 2013, received in revised form December 1, 2013, accepted March 11, 2014
Vol. 5, No. 2, Pages 93-100 DOI: 10.4416/JCST2013-00024
Abstract
LaCrO3 and La0.9Ca0.1CrO3 ceramics were synthesized in the modified glycine nitrate process (MGNP). The effect of the equivalence ratio Φe of precursor mixtures on the combustion reaction was investigated by means of DSC and TG-FTIR analyses. It was found that for Φe > 0.65 the combustion reaction proceeds in a self-propagating one-step process, resulting in the formation of well-crystallized single-phase powders. Further glycine addition (Φe < 0.65) leads to sluggish multi-step combustion, which is typical for fuel-rich combustion, and the formation of secondary phases such as La2CrO6. Furthermore it could be found that the ignition temperature of the precursors rises with rising fuel content. An influence of the equivalence ratio on the specific surface area and particle size of synthesized powders could not be detected. The specific surface area of the powders was in the range of 5 – 10 m2/g and particle size 100 – 150 nm.
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Keywords
Lanthanum chromite, modified glycine nitrate process, combustion synthesis
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