Magnetic properties of magnetite nanoparticles synthesized by forced hydrolysis

We report the synthesis of superparamagnetic nanoparticles of iron oxide in magnetite phase with diameters of approximately 15 nm. Nanoparticles of magnetite were synthesized by forced hydrolysis method, controlling the oxidation with a nitrogen atmosphere during the synthesis. Nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Mössbauer spectroscopy and vibrating sample magnetometry. Quantitative analysis of crystalline phases was done by performing Rietveld refinement of the XRD profiles. In order to obtain nanometers sizes of magnetite phase solely, the parameters of formation such a pH and molar concentration were analyzed and determined by an equilibrium thermodynamics model with the chemical computer code MINTEQA [Allison Geoscience Consultants, Inc., HydroGeoLogic, Inc., MINTEQA2 for Windows, Equilibrium Speciation Model. Ver 1.5(2003)]. © 2008 Elsevier B.V. All rights reserved.

Chemical analysis; Magnetic materials; Magnetite; Nanomaterials; Nanoparticles; Superparamagnetism Chemical speciation; Concentration (process); Hydrogeology; Hydrolysis; Iron; Iron ores; Iron oxides; Magnetic properties; Magnetism; Magnetite; Molybdenum; Nanoparticles; Nanostructures; Nitrogen; Nonmetals; Oxide minerals; Paramagnetism; Programming theory; Rietveld analysis; Rietveld method; Rietveld refinement; Superparamagnetism; X ray analysis; X ray diffraction analysis; Chemical analysis; Chemical-; Computer coding; Crystalline phases; Equilibrium thermodynamics; Forced hydrolysis; Geoscience; Magnetic materials; Magnetite nanoparticles; Magnetite phase; Molar concentrations; Nanomaterials; Nitrogen atmospheres; Quantitative analysis; Rietveld; Ssbauer spectroscopy; Superparamagnetic nanoparticles; transmission electron microscopy (TEM); Vibrating-sample magnetometry; X-ray diffraction; Nanostructured materials

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