The application of infrared spectroscopy to the study of rust systems—II. Study of cation deficiency in magnetite (Fe3O4) produced during its transformation to maghemite (γ-Fe2O3) and hematite (α-Fe2O3)

Nasrazadani, S.; Raman, A.

doi:10.1016/0010-938x(93)90092-u

Cited by 160 publications

(89 citation statements)

References 25 publications

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“…Figure 7 shows the infrared spectra of the magnetite with a different particle size, the band at 600 cm -1 approximately is broadening when the particle size decreases. According to Nasrazadani (1993) this effect indicates an increment of cation vacancy in the lattice, this behavior corroborated with the decreased value of the lattice parameter, which is shown in table 2. These values are minor than the lattice parameter of defect free magnetite (8.396 A ), this small reduction is assumed to be due to the prevalence of a small amount of cation deficiency.…”

Section: Chemical Coprecipitation With Reflux and Aging Conditionssupporting

confidence: 60%

Infrared Spectroscopy of Functionalized Magnetic Nanoparticles

García-Casillas¹,

González²,

Perez³

2012

Infrared Spectroscopy - Materials Science, Engineering and Technology

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Section: Chemical Coprecipitation With Reflux and Aging Conditionssupporting

confidence: 60%

Infrared Spectroscopy of Functionalized Magnetic Nanoparticles

García-Casillas¹,

González²,

Perez³

2012

Infrared Spectroscopy - Materials Science, Engineering and Technology

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“…Assuming that the outer layer is solely responsible for the presence of the doublets, one can estimate that the thickness of this layer must be (2.0 ± 0.5) nm. This value is over twice larger than the lattice parameter for maghemite which for nanoparticles varies from 0.833 to 0.838 nm [10].…”

Section: Resultsmentioning

confidence: 74%

Microstructure and Magnetic Properties of Iron Oxide Nanoparticles Prepared by Wet Chemical Method

et al. 2008

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The magnetic properties of iron oxide nanoparticles prepared by the chemical decomposition of the iron chlorides with the ratio Fe 3+ /Fe 2+ = 2.25 were studied by means of transmission electron microscopy, X-ray diffraction and Mössbauer spectroscopy in-and without external magnetic field. The transmission electron microscopy studies show that the nanoparticles have spherical shape with diameter about 13 nm. The transmission electron microscopy and X-ray diffraction patterns are composed of lines that could be indexed within the cubic spinel structure. The room temperature Mössbauer spectrum shows the coexistence of the broad magnetically split part and superparamagnetic doublet. The in-field Mössbauer measurements carried out in the temperature range from room temperature down to 13 K show a gradual increase in the spin canting on the surface of the nanoparticles and decrease in the intensity of the superparamagnetic doublet. The sample was subjected to annealing process performed at elevated temperature in air atmosphere in order to change the microstructure of the nanoparticles and in consequence to change the magnetic properties of the sample. The annealing process leads to the decrease in the value of quadrupole splitting of the superparamagnetic doublets.

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“…This result is quite surprising [25]. Indeed, for stoichiometries with low Co 2+ cations content, we would have expected iron cations to replace some of the Oh sites, modifying thus the inversion parameter.…”

Section: Discussionmentioning

confidence: 92%

Determination of the cation site distribution of the spinel in multiferroic CoFe 2 O 4 /BaTiO 3 layers by X-ray photoelectron spectroscopy

Aghavnian

Moussy

Stanescu

et al. 2015

Journal of Electron Spectroscopy and Related Phenomena

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a b s t r a c tThe properties of CoFe 2 O 4 /BaTiO 3 artificial multiferroic multilayers strongly depend on the crystalline structure, the stoichiometry and the cation distribution between octahedral (Oh) and tetrahedral (Td) sites (inversion factor). In the present study, we have investigated epitaxial CoFe 2 O 4 layers grown on BaTiO 3 , with different Co/Fe ratios. We determined the cation distribution in our samples by X-ray magnetic circular dichroism (XMCD), a well accepted method to do so, and by X-ray photoelectron spectroscopy (XPS), using a fitting method based on physical considerations. We observed that our XPS approach converged on results consistent with XMCD measurements made on the same samples. Thus, within a careful decomposition based on individual chemical environments it is shown that XPS is fully able to determine the actual inversion factor.

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The application of infrared spectroscopy to the study of rust systems—II. Study of cation deficiency in magnetite (Fe3O4) produced during its transformation to maghemite (γ-Fe2O3) and hematite (α-Fe2O3)

Cited by 160 publications

References 25 publications

Infrared Spectroscopy of Functionalized Magnetic Nanoparticles

Infrared Spectroscopy of Functionalized Magnetic Nanoparticles

Microstructure and Magnetic Properties of Iron Oxide Nanoparticles Prepared by Wet Chemical Method

Determination of the cation site distribution of the spinel in multiferroic CoFe 2 O 4 /BaTiO 3 layers by X-ray photoelectron spectroscopy

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