6533b823fe1ef96bd127f37d

RESEARCH PRODUCT

Study of the structural phase transformation of iron oxide nanoparticles from an Fe2+ ion source by precipitation under various synthesis parameters and temperatures

I. KuusikTanel KäämbreAndris ŠUtkaSanta LagzdinaRainer PärnaVambola KisandJanis KleperisMikhail MaiorovDmitrijs JakovlevsArvo Kikas

subject

X-ray absorption spectroscopyAqueous solutionMaterials scienceAbsorption spectroscopyScanning electron microscopeAnalytical chemistryCondensed Matter Physicschemistry.chemical_compoundchemistryX-ray photoelectron spectroscopyDifferential thermal analysisGeneral Materials ScienceIron oxide nanoparticlesPowder diffraction

description

Abstract Magnetite nanoparticles were precipitated from a pure aqueous ferrous salt solution in an air atmosphere. The influence of the solution molarity, the rate of precipitator agent addition, stirring time and annealing temperature was studied. The morphology, crystalline phase purity and magnetic properties of the obtained powders were studied by X-Ray powder diffraction (XRD), Scanning electron microscopy (SEM), Differential thermal analysis (DTA), X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS) and Vibrating sample magnetometer (VSM). The synthesis conditions were seen to have an effect on phase composition. It was possible to obtain near stoichiometric Fe 3 O 4 or a mixture of Fe 3 O 4 , γ-Fe 2 O 3 , α-Fe 2 O 3 and FeOOH. Fe 3 O 4 nanoparticles showed high saturation magnetization ∼86 emu/g.

yearjournalcountryeditionlanguage
2015-01-01Materials Chemistry and Physics
https://doi.org/10.1016/j.matchemphys.2014.10.048