title: Structure and morphology of spinel MFe2O4 (M=Fe, Co, Ni) nanoparticles chemically synthesized from heterometallic complexes.
abstract: We synthesized magnetic spinel ferrites from trimetallic single-source precursors. Fe(II), Co(II), and Ni(II) ferrite nanoparticles in the range of 9-25 nm were synthesized by solvothermal decomposition of trimetallic acetate complex precursors in benzyl ether in the presence of oleic acid and oleylamine, using 1,2-dodecanediol as the reducing agent. For comparison, spinel ferrite nanoparticles were synthesized by stoichiometric mixtures of metal acetate or acetylacetonate salts. The nanoparticles (NP) were characterized by TEM, DLS, powder XRD, and Raman spectroscopy; and their magnetic properties were characterized by ZFC-FC and M(H) measurements. The ferrite-NP were more homogeneous and had a narrower size distribution when trimetallic complexes were used as precursors. As a consequence, the magnetic properties of these ferrite-NP are closer to the aimed room temperature superparamagnetic behavior, than are those of other ferrites obtained by a mixture of salts.
authors: Universidade Federal do Paraná, Departamento Química, Curitiba, Paraná, Brazil.
authors: Karine Priscila
authors: KP
authors: Naidek
authors: Flavia
authors: F
authors: Bianconi
authors: Tulio Costa Rizuti
authors: TC
authors: da Rocha
authors: Daniela
authors: D
authors: Zanchet
authors: Juliano Alves
authors: JA
authors: Bonacin
authors: Miguel Alexandre
authors: MA
authors: Novak
authors: Maria das Graças Fialho
authors: Md
authors: Vaz
authors: Herbert
authors: H
authors: Winnischofer