Lanthanum cobaltite nanoparticles using the polymeric precursor method |
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| Authors: | Monica Popa Jose M. Calderon-Moreno |
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| Affiliation: | 1. Laboratório de Combustíveis e Materiais, Departamento de Química, Universidade Federal da Paraíba, João Pessoa, PB, Brazil;2. Departamento de Engenharia de Materiais/CT, Universidade Federal do Rio Grande do Norte, Campus I, Natal, RN, Brazil;3. Departamento de Química, Universidade Federal do Rio Grande do Norte, Campus I, Natal, RN, Brazil;4. CMDMC, Instituto de Química, UNESP-Araraquara, Araraquara, SP, Brazil;5. Centro Acadêmico do Agreste, Br 104, km 62, Nova Caruaru, Caruaru, PE, Brazil;1. Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education, Lanzhou University, Lanzhou 730000, People’s Republic of China;2. College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, People’s Republic of China;1. National Research & Development Institute for Electrical Engineering ICPE-CA, 313 Splaiul Unirii, 030138 Bucharest, Romania;2. POLITEHNICA University Bucharest, Faculty of Applied Chemistry and Material Science, 313 Splaiul Independentei, 060042 Bucharest, Romania |
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| Abstract: | The present study reports the evolution of reactive lanthanum cobaltite nanoparticles obtained by a polymeric precursor route, using citric acid as chelating agent. The crystallization from amorphous precursor, particle growth and the formation of nanoparticle agglomerates at different calcination temperatures was carried out by conventional and high-resolution electron microscopy, electron diffraction and energy-dispersive X-ray analysis and Raman spectroscopy. Microstructure measurements were compared with X-ray diffraction and chemical analysis results. Electron diffraction, combined with TEM, was used to determine the proportion of amorphous phase. The presence of amorphous carbon during the decomposition of the amorphous precursor was analyzed by Raman spectroscopy. The coherent crystalline domain size and the particle size have been monitored by XRD and electron microscopy in order to determine the evolution of both crystal size and the temperature onset for the formation of polycrystalline aggregates.The results demonstrate that at 550 °C we obtain pure single-phase equiaxed nanopowders of LaCoO3 with crystal size of 20 nm, free of amorphous carbon and without the presence of polycrystalline aggregates. |
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