Navegando por Autor "Medeiros, Susana Nóbrega de"
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Artigo The effect of Sr2+ on the structure and magnetic properties of nanocrystalline cobalt ferrite(Elsevier, 2015-04-15) Araújo, José Humberto de; Lima, Aldenir Cavalcanti; Peres, Ana Paula Da Silva; Torres, Marco Antônio Morales; Medeiros, Susana Nóbrega de; Soares, João Maria; Melo, Daniel Macedo A.; Carriço, Artur da SilvaWe report the effect of Sr2+ on the structure, morphology and magnetic properties of CoFe2O4 synthesized by microwave-assisted combustion method. Results from X-ray diffraction and Mössbauer spectroscopy at 298 K suggest the formation of a mixed spinel Sr2+ substituted CoFe2O4. However, secondary phases like CoO, SrCO3 and SrFeO2.96 were also observed. A decrease in the lattice parameter and particle size were observed with the addition of Sr2+. The crystallite size of ferrite phase ranged from 53 to 62 nm. Magnetic studies showed a gradual decrease in the saturation magnetization and remanence with the increase of Sr2+ content, and an increasing value of the coercive field