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Nanometric particle size and phase controlled synthesis and characterization of γ-Fe2O3 or (α + γ)-Fe2O3 by a modified sol-gel method
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10.1063/1.4821253
/content/aip/journal/jap/114/10/10.1063/1.4821253
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/10/10.1063/1.4821253

Figures

Image of FIG. 1.
FIG. 1.

FTIR spectra for obtained iron oxides, with zoom in the region of 800-400 cm, showing the bands related with Fe-O vibrations. Inset: FTIR spectrum of A6 for the entire region of wavenumber.

Image of FIG. 2.
FIG. 2.

XRD pattern of A6, A12, A18, and A24 samples. The Miller indices of reflection are assigned as * for maghemite and # for hematite.

Image of FIG. 3.
FIG. 3.

TEM micrographs of the A6 sample presenting two different morphologies (JEOL JEM-1400 at 120 kV).

Image of FIG. 4.
FIG. 4.

TEM micrographs of the A18 sample, composed by cubic particles of 15 nm of average size (Zeiss EM10 at 80 kV).

Image of FIG. 5.
FIG. 5.

Photoacoustic UV-Vis spectra of A6 and A18 samples.

Image of FIG. 6.
FIG. 6.

Determination of E from Tauc's equation for (a) direct transitions (m = 0.5) and (b) indirect transitions (m = 2). The curves in bold line are the extrapolation of the Tauc's equation.

Image of FIG. 7.
FIG. 7.

ZFC (open symbols) and FC (solid symbols) magnetization curves of A6, A12, A18, and A24 samples at H = 500 Oe.

Image of FIG. 8.
FIG. 8.

Dependence of magnetization on temperature in a magnetic field of 10 kOe.

Image of FIG. 9.
FIG. 9.

Room-temperature magnetization vs magnetic applied field curves.

Image of FIG. 10.
FIG. 10.

Mossbauer spectra for A6, A12, A18, and A24 samples taken at room temperature.

Tables

Generic image for table
Table I.

Maghemite and hematite amount (in wt. %) and particle size of each phase for the obtained samples by modified sol-gel method.

Generic image for table
Table II.

Hyperfine parameters and subspectral areas for the obtained iron oxides.

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/content/aip/journal/jap/114/10/10.1063/1.4821253
2013-09-13
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nanometric particle size and phase controlled synthesis and characterization of γ-Fe2O3 or (α + γ)-Fe2O3 by a modified sol-gel method
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/10/10.1063/1.4821253
10.1063/1.4821253
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