Direct determination of the cation disorder in nanoscale spinels by NMR, XPS, and Mössbauer spectroscopy

Šepelák, V.; Indris, Sylvio; Heitjans, Paul; Becker, Klaus‐Dieter

doi:10.1016/j.jallcom.2006.08.173

Cited by 50 publications

(23 citation statements)

References 8 publications

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“…5a-c respectively. The binding energy of the main Zn 2p 3/2 line is at 1022 eV and is typical of the Zn 2+ oxidation state in mixed oxides which is in good agreement with published data [16,29,30,34,55]. The W4f line is slightly broadened and presented by two components with binding energies of W 4f 7/2 at 36.3 and at 34.8 eV, respectively (Fig.…”

Section: Xps Analysissupporting

confidence: 91%

Mechanochemical synthesis of nanocrystalline ZnWO4 at room temperature

Mancheva

Iordanova

Dimitriev

2011

Journal of Alloys and Compounds

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Section: Xps Analysissupporting

confidence: 91%

Mechanochemical synthesis of nanocrystalline ZnWO4 at room temperature

Mancheva

Iordanova

Dimitriev

2011

Journal of Alloys and Compounds

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“…Taking into account that the KLE-templated CdFe 2 O 4 thin films studied in this work are solution processed via solgel methods, nanocrystalline, and further also highly textured, they are expected to show an inversion parameter different from that reported for microcrystalline material. [39,[48][49][50] To obtain information about the crystallization behavior, chemical composition, electronic bonding configuration, and the cation distribution, a series of X-ray diffraction (XRD), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS) measurements were carried out. In the following sections, we specifically focus on KLE-templated CdFe 2 O 4 thin films heated to 650…”

Section: Fig S3 In Esi)mentioning

confidence: 99%

Morphology, Microstructure, and Magnetic Properties of Ordered Large-Pore Mesoporous Cadmium Ferrite Thin Film Spin Glasses

et al. 2013

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RECEIVED DATE (to be automatically inserted after your manuscript is accepted if requiredaccording to the journal that you are submitting your paper to) 2 ABSTRACT Herein, we report the synthesis, microstructure, and magnetic properties of nanocrystalline cadmium ferrite (CdFe 2 O 4 ) thin films with both an ordered cubic structure of 18 nm diameter pores and singlephase spinel grains averaging 13 nm in diameter. These mesoporous materials were produced through facile polymer templating of hydrated nitrate salt precursors. Both the morphology and microstructure, including cation site occupancy and electronic bonding configuration, were analyzed in detail by electron microscopy, grazing incidence small-angle X-ray scattering, Raman and X-ray photoelectron spectroscopy, and N 2 -physisorption. The data obtained demonstrate that the network of pores is retained up to annealing temperatures as high as 650 °C -the onset of crystallization is at ϑ = (590 ± 10) °C. Furthermore, they show that the polymer-templated samples exhibit a "partially" inverted spinel structure with inversion parameter  = 0.40 ± 0.02, which is different from microcrystalline CdFe 2 O 4

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“…The iron cations from tetrahedral sites have the magnetic moments coupled antiparallel with the magnetic moments of nickel and iron from octahedral sites [6]. It was highlighted that in the nanocrystalline/nanostructured state nickel ferrite has magnetic properties which differ from the polycrystalline state [8][9][10]. In order to produce nickel ferrite in nanocrystalline/nanostructured state several methods such as sol-gel [11,12], solvothermal [13], co-precipitation [14], bottom up [15], microemulsion [16] or hydrothermal [17] are used.…”

Section: Introductionmentioning

confidence: 99%

“…Beside those methods the mechanochemical synthesis route is a useful method for producing the nickel ferrite in nanocrystalline state. For producing the nanocrystalline nickel ferrite by mechano-chemical synthesis two ways are used: (i) in the first one, the ferrite is formed in the nanocrystalline state by solid state reaction between precursors during milling [9,[18][19][20]; (ii) in the second one, the polycrystalline nickel ferrite obtained by other methods is milled in order to reduce the grain size and to refine the structure [10,21,22]. Several studies where reported regarding the producing of nanocrystalline nickel ferrite by mechano-chemical route, but the results are very different depending on the experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, structural and magnetic characterization of nanocrystalline nickel ferrite—NiFe2O4 obtained by reactive milling

Marinca

Chicinaş

Isnard

et al. 2011

Journal of Alloys and Compounds

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a b s t r a c tNanocrystalline nickel ferrite (NiFe 2 O 4 ) has been synthesized from a stoichiometric mixture of oxides NiO and ␣-Fe 2 O 3 in a high energy planetary mill. An annealing at 350 • C, after milling, was used to improve the solid state reaction. The obtained powders were investigated by X-ray diffraction, magnetic measurements, scanning electron microscopy, X-ray microanalysis and differential scanning calorimetry. The particles size distribution was analyzed using a laser particle size analyser. The nickel ferrite begins to form after 4 h of milling and continuously form up to 16 h of milling. The obtained nickel ferrite has many inhomogeneities and a distorted spinel structure. The mean crystallites size at the final time of milling is 9 ± 2 nm and the lattice parameter increases with increase the milling time. DSC measurements revealed a large exothermic peak associated with cations reordering in the crystalline structure. The magnetization of the obtained powder depends on the milling time and annealing. After the complete reaction between the starting oxides the milling reduces the magnetization of the samples. The magnetization increases after annealing, due to the reorganization of the cations into the spinel structure.

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Direct determination of the cation disorder in nanoscale spinels by NMR, XPS, and Mössbauer spectroscopy

Cited by 50 publications

References 8 publications

Mechanochemical synthesis of nanocrystalline ZnWO4 at room temperature

Mechanochemical synthesis of nanocrystalline ZnWO4 at room temperature

Morphology, Microstructure, and Magnetic Properties of Ordered Large-Pore Mesoporous Cadmium Ferrite Thin Film Spin Glasses

Synthesis, structural and magnetic characterization of nanocrystalline nickel ferrite—NiFe2O4 obtained by reactive milling

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