Raman Spectra and Vibrational Analysis of BaFe12O19Hexagonal Ferrite

Kreisel, J.; Lucazeau, G.; Vincent, H.

doi:10.1006/jssc.1997.7737

Cited by 346 publications

(154 citation statements)

References 43 publications

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“…As for magnetite and nickel ferrite, the structure would correspond to an inverse spinel, having half of the Fe 3C ions in the tetrahedral sites. 19 concluded that the A1g band in the 670-720 cm 1 spectral range of the inverse spinels may be assigned to a vibrational mode of FeO 4 tetrahedra, in good agreement with other authors. 20,21 This band, indeed, seems to occur irrespective of the chemical nature of the bivalent cation.…”

Section: Analysis Of the 5 Nm Thick Fe 3 O 4 Filmsupporting

confidence: 77%

Surface and interface properties of epitaxial iron oxide thin films deposited on MgO(001) studied by XPS and Raman spectroscopy

Ruby

Humbert

Fusy

2000

Surf. Interface Anal.

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Section: Analysis Of the 5 Nm Thick Fe 3 O 4 Filmsupporting

confidence: 77%

Surface and interface properties of epitaxial iron oxide thin films deposited on MgO(001) studied by XPS and Raman spectroscopy

Ruby

Humbert

Fusy

2000

Surf. Interface Anal.

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“…According to the literature, both Raman modes at 612 and 682 cm -1 are reflecting the local lattice effect in the tetrahedral sublattice, while the peak at 468 cm -1 is probing the local lattice effect in the octahedral sublattice. 39,40 The same Raman bands mentioned above as well as additional bands at 222 cm -1 and 286 cm -1 can be seen in samples ZC31/4 to ZC11/8; these additional bands can be assigned to α-Fe 2 O 3 , which has very intense bands at these positions, shown in the Figure 3 for convenience. The Raman data thus confirm the observed significant difference between sample ZC13/8 and samples ZC31/4 to ZC11/8 by Mossbauer spectroscopy, i.e.…”

Section: 2 Phase Composition and Crystal Structure Of Ternary MIXsupporting

confidence: 66%

Mixed Metal Oxides of the Type CoxZn1–xFe2O4 as Photocatalysts for Malachite Green Degradation Under UV Light Irradiation

Tzvetkov¹,

Milanova²,

Cherkezova‐Zheleva

et al. 2017

ACSi

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A combination of thermal and mechanical (high energy ball milling) treatment was applied in an attempt to obtain polycrystalline mixed metal binary and ternary oxides of the type Co x Zn 1-x Fe 2 O 4 (x = 0; 0.25; 0.5; 0.75; 1). The synthetic procedure used successfully produced single-phased, homogeneous ZnFe 2 O 4 , CoFe 2 O 4 , and Co 0.75 Zn 0.25 Fe 2 O 4 , as well as mixed oxides, whose composition depended both on the duration of the high energy ball milling and the ratio Zn(II)/Co(II). The formation of spinel-like structures was proved by XRD, Mössbauer spectroscopy and Raman spectroscopy. For the characterization of the samples low-temperature N 2 adsorption, UV/Vis spectroscopy and transmission electron microscopy were applied. The energy band gap of the samples was calculated, suggesting they are promising photocatalysts. The decomposition of the Malachite Green in model water solutions under UV-light irradiation was successfully achieved in the presence of the samples as photocatalysts. The highest rate constant was obtained for the sample synthesized at longer milling time in combination with higher Zn(II)/Co(II) ratio. The photocatalytic activity of the ternary mixed oxides was compared with the pure hematite, α-Fe 2 O 3 , and the binary ZnFe 2 O 4 and CoFe 2 O 4 ferrites with spinel structure that were treated in the same way. A synergetic effect of α-Fe 2 O 3 and the spinel-like structure on the photocatalytic properties of ternary mixed metal oxides was detected.

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“…Wide peaks at around 190, 350, 500 and 700 cm -1 are characteristic for maghemite (circles), while narrow peaks at 225, 247, 299, 412, 498 and 613 cm -1 belong to hematite (diamonds). Popup and a evanescent narrow peak at 690 cm -1 may be assigned to a bipyramidal FeO 5 [12]. The presence of maghemite is not surprising since fine powdered magnetite easily undergoes oxidation, which may be induced by laser radiation during the measurement or due to calcination of potassium doped materials [13].…”

Section: Resultsmentioning

confidence: 99%

Influence of Potassium and NO Addition on Catalytic Activity in Soot Combustion and Surface Properties of Iron and Manganese Spinels

et al. 2013

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Two series of (0-4 wt%) potassium doped oxide catalysts based on iron and manganese spinel were prepared. The synthesized materials were characterized in terms of their structure (XRD, Raman spectroscopy) and surface electronic properties (work function measurements). The catalytic activity towards soot combustion was determined by temperature programmed oxidation of a physical mixture of soot and catalyst in tight contact in gas oxygen mixtures with and without NO addition. For iron spinel based materials, where potassium is localized at the surface, the catalytic activity correlates with the work function lowering upon K doping, while for manganese spinel based materials, where potassium is incorporated into the bulk (formation of KMn 4 O 8 or KMn 8 O 16 ), the correlation was not found. The presence of NO in the gas mixture leads to a systematic decrease of soot ignition temperature for all samples.

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Raman Spectra and Vibrational Analysis of BaFe12O19Hexagonal Ferrite

Cited by 346 publications

References 43 publications

Surface and interface properties of epitaxial iron oxide thin films deposited on MgO(001) studied by XPS and Raman spectroscopy

Surface and interface properties of epitaxial iron oxide thin films deposited on MgO(001) studied by XPS and Raman spectroscopy

Mixed Metal Oxides of the Type CoxZn1–xFe2O4 as Photocatalysts for Malachite Green Degradation Under UV Light Irradiation

Influence of Potassium and NO Addition on Catalytic Activity in Soot Combustion and Surface Properties of Iron and Manganese Spinels

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