Synthesis, structure, morphology and stoichiometry characterization of cluster and nano magnetite

We have studied the stoichiometry of magnetite nanoparticles using three spectroscopic techniques: Mössbauer, photoacoustic and ferromagnetic resonance (FMR). By varying the weight ratio of the Fe precursor to the reducing agent (sodium acetate) and a post-synthesis annealing, we were able to synthe...

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Bibliographic Details
Published in:Materials chemistry and physics 2016-08, Vol.178, p.182-189
Main Authors: Singh, L. Herojit, Pati, S.S., Guimarães, Edi M., Rodrigues, P.A.M., Oliveira, Aderbal C., Garg, V.K.
Format: Article
Language:English
Subjects:
Annealing
Electron paramagnetic resonance
Magnetic materials
Magnetite
Nanoparticles
Nanostructure
Nanostructures
Optical properties
Photoacoustic spectroscopy
Spectroscopy
Stoichiometry
Vacancies
Weight reduction
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Summary:We have studied the stoichiometry of magnetite nanoparticles using three spectroscopic techniques: Mössbauer, photoacoustic and ferromagnetic resonance (FMR). By varying the weight ratio of the Fe precursor to the reducing agent (sodium acetate) and a post-synthesis annealing, we were able to synthesize samples with different amounts of Fe vacancies, from stoichiometric Fe3O4 to γ-Fe2O3. By synthesizing magnetite in the presence of zeolite we obtained nanoparticles within the 3–10 nm diameter range. The spectroscopic results show that there is a correlation between the amount of Fe vacancies and (i) the optical absorption and (ii) the g-values from the Electron paramagnetic resonance EPR spectra of the nanoparticles. [Display omitted] •Magnetite nanoparticles and cluster synthesized.•Photoacoustic spectroscopy is effective in determining the stoichiometry.•Particles with 9 nm size has 0 
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2016.05.003