Self-propagating high-temperature synthesis of LaMO3 perovskite-type oxide using heteronuclearcyano metal complex precursors

• Published in: Journal of alloys and compounds 2015-11, Vol.649, p.1291-1299
• Main Authors: Sánchez-Rodríguez, Daniel, Wada, Hiroki, Yamaguchi, Syuhei, Farjas, Jordi, Yahiro, Hidenori
• Format: Article
• Language: English
• Subjects: Combustion synthesis; Heteronuclearcyano complex; Perovskite-type oxide; SHS
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2015.07.246

The decomposition of La[Fe(CN)6]·5H2O and La[Co(CN)6]·5H2O under different atmospheres has been analyzed by thermogravimetry (TG) and differential thermal analysis (DTA). In addition, the decomposition temperature at different sample locations was monitored for sample masses around 2 g of La[Fe(CN)6]·5H2O and La[Co(CN)6]·5H2O, when they were calcined for 1 h at temperatures ranging from 200 to 400 °C in a controlled gas-flow system. Results showed that, the large enough of the cyano complex precursors undergo combustion when they are decomposed under oxygen atmosphere. X-ray diffraction results revealed that perovskite-type oxides crystallize due to the overheating of the process. As a result, it has been possible to produce LaFeO3 and LaCoO3 perovskite-type oxide powders by SHS under oxygen atmosphere using La[Fe(CN)6]·5H2O and La[Co(CN)6]·5H2O as a precursor. The effect of the ignition temperature has been investigated. The specific surface area of the perovskite-type oxides produced via SHS using heteronuclearcyano metal complex as a precursor is significantly higher than that of other LaMO3 produced using the same technique but obtained from other type of precursors. •The decomposition of La[Fe(CN)6] and La[Co(CN)6] precursors was analyzed.•The combustion process proceeded under oxygen when sample was large enough.•Perovskite oxides via SHS from the cyano complex precursors were synthesized.•LaMO3 perovskite oxides via SHS was obtained with high specific surface area.