A.C. Lima, A.P.S. Peres, J.H. Araújo, M.A. Morales, S.N. Medeiros, J.M. Soares, D.M.A. Melo, A.S. Carriço. The effect of Sr2+ on the structure and magnetic properties of nanocrystalline cobalt ferrite

Publicado em 02.08.2015 às 18:34:44

Abstract We 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.

Keywords Combustion method; Nanoparticles; CoFe2O4; Mössbauer spectroscopy; Magnetic properties