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

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

© Journal of Alloys and Compounds, 2015, vol. 649, p. 1291-1299

Elsevier

Autor: Sánchez-Rodríguez, Daniel
Wada, Hiroki
Yamaguchi, Syuhei
Farjas Silva, Jordi
Yahiro, Hidenori
Data: 15 novembre 2015
Resum: 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
Format: application/pdf
ISSN: 0925-8388
Accés al document: http://hdl.handle.net/10256/10980
Llenguatge: eng
Editor: Elsevier
Col·lecció: Versió preprint del document publicat a: http://dx.doi.org/10.1016/j.jallcom.2015.07.246
Articles publicats (D-F)
És part de: © Journal of Alloys and Compounds, 2015, vol. 649, p. 1291-1299
Drets: Tots els drets reservats
Matèria: Compostos metàl·lics -- Síntesi
Metallic composites -- Synthesis
Títol: Self-propagating high-temperature synthesis of LaMO3 perovskitetype oxide using heteronuclearcyano metal complex precursors
Tipus: info:eu-repo/semantics/article
Repositori: DUGiDocs

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