TY - JOUR
T1 - Preparation of Nanosized LaCoO3 through Calcination of a Hydrothermally Synthesized Precursor
AU - Tepech-Carrillo, L.
AU - Escobedo-Morales, A.
AU - Pérez-Centeno, A.
AU - Chigo-Anota, E.
AU - Sánchez-Ramírez, J. F.
AU - López-Apreza, E.
AU - Gutiérrez-Gutiérrez, J.
N1 - Publisher Copyright:
© 2016 L. Tepech-Carrillo et al.
PY - 2016
Y1 - 2016
N2 - A method for obtaining nanosized LaCoO3 crystals from calcination of a precursor powder synthesized by a hydrothermal route is reported. Details concerning the evolution of the microstructure and formation mechanism of the perovskite phase were studied by powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, Raman spectroscopy, and thermal analysis. It was found that the morphology of the sample progressively turns from a mix of fibers and rods to interconnected nanocrystals. It is determined that LaCoO3 phase is produced by a reaction of cobalt and lanthanum oxides, the latter produced by a two-step dehydration process of La(OH)3. Finally, it was found that nearly stoichiometric LaCoO3 nanocrystals can be obtained at temperatures as low as 850°C. Nevertheless, whether higher calcination temperatures are used, appropriate reaction times and a controlled atmosphere are required in order to avoid formation of lanthanum carbonates and high density of lattice defects.
AB - A method for obtaining nanosized LaCoO3 crystals from calcination of a precursor powder synthesized by a hydrothermal route is reported. Details concerning the evolution of the microstructure and formation mechanism of the perovskite phase were studied by powder X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, Raman spectroscopy, and thermal analysis. It was found that the morphology of the sample progressively turns from a mix of fibers and rods to interconnected nanocrystals. It is determined that LaCoO3 phase is produced by a reaction of cobalt and lanthanum oxides, the latter produced by a two-step dehydration process of La(OH)3. Finally, it was found that nearly stoichiometric LaCoO3 nanocrystals can be obtained at temperatures as low as 850°C. Nevertheless, whether higher calcination temperatures are used, appropriate reaction times and a controlled atmosphere are required in order to avoid formation of lanthanum carbonates and high density of lattice defects.
UR - http://www.scopus.com/inward/record.url?scp=84979659109&partnerID=8YFLogxK
U2 - 10.1155/2016/6917950
DO - 10.1155/2016/6917950
M3 - Artículo
SN - 1687-4110
VL - 2016
JO - Journal of Nanomaterials
JF - Journal of Nanomaterials
M1 - 6917950
ER -