Abstract
This paper describes the obtention of LaCoO3 nanopowders by the co-precipitate method with ammonium hydroxide from solvent such as water, ethyl alcohol and ethylene glycol. The crystalline structure and average particle size are dependent of type-solvent. The XRD patterns indicated that the LaCoO3 nanopowders prepared with water and ethyl alcohol exhibit a pure perovskite-type LaCoO3 in the rhombohedra structure. The average diameter of the particles prepared with ethyl alcohol and water are 27±4.49nm and 64.4±12.92nm respectively. High resolution transmission electron microcopy revealed an oriented attachment mechanism for the growth of aggregated LaCoO3 nanocrystals. Room temperature magnetization results of the heat treated LaCoO3 nanopowders exhibited a paramagnetic behavior. The average particle size and formation temperature of LaCoO3 obtained in this study is comparatively lower than those reported in the literature.
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