Mössbauer spectroscopy analysis of the phase composition of iron-based nanoparticles

Vasil’eva, E. S.; Толочко, О. В.; Семенов, В. Г.; Volodin, V. S.; Kim, D.

doi:10.1134/s1063785007010117

Cited by 9 publications

(6 citation statements)

References 4 publications

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“…Note that the experimental MS Zn x Fe 3−x O 4 (Fig. 7, a) are similar to those obtained, e. g. in [38,[52][53][54][55][56][57][58] and reference therein. The dots in Fig.…”

Section: Mossbauer Studies Of Mnps Znsupporting

confidence: 87%

“…Figure7, a shows the experimental MS of MNPs Zn x Fe 3−x O 4 (0 ≤ x ≤ 1) without PAA coating obtained at room temperature (300 K). Note that the experimental MS Zn x Fe 3−x O 4 (Fig.7, a) are similar to those obtained, e. g. in[38,[52][53][54][55][56][57][58] and reference therein. The dots in Fig.7, a denote the experimental values, while the model components obtained using the program[29] are shown as solid lines.…”

supporting

confidence: 87%

“…However, even high-resolution electron microscopy often fails to distinguish between the core and shell due to the similarity of their phase-contrast image [40]. In such cases, the use of Mossbauer spectroscopy 57 Fe makes it possible to obtain unique information about the structural and magnetic properties of ferrite-spinels [40][41][42], as well as bimagnetic structures of the core−shell type [43][44][45]. This is due to the fact that Mossbauer spectroscopy can distinguish between different states of iron, since the isomer shift (IS) is sensitive to the oxidation degree of iron (Fe 2+ , Fe 3+ in spinels) and the quadrupole splitting (QS) is sensitive to different types of structural positions (octahedral and tetrahedral in spinels) and positions of neighboring ions.…”

Section: Sem and Edx Resultsmentioning

confidence: 99%

“…Besides, using the Mossbauer effect, information about the magnetic structure can be extracted from the values of the effective magnetic fields (H eff ), because iron-containing materials in the superparamagnetic (unblocked) and ferromagnetic/antiferromagnetic (blocked) states have essentially different values of the effective fields. In addition, the particle size distribution is related to the full width at half-amplitude of the absorption line in the Mossbauer spectrum, as well as to the distributions of the Mossbauer spectroscopy parameters 57 Fe.…”

Section: Sem and Edx Resultsmentioning

confidence: 99%

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Zn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=- (0 ≤ x≤ 1.0) magnetic nanoparticles functionalized with polyacrylic acid (PAA)

et al. 2022

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Studies of the properties of ZnxFe3-xO4 (x=0, 0.25, 0.5, 0.75, 1.0) magnetic nanoparticles synthesized by a modified hydrothermal method are presented in comparison with the properties of the same nanoparticles stabilized with polyacrylic acid ZnxFe3-xO4@PAA. The structure, size, morphology, and magnetic properties of the samples were studied by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT IR), physical properties measurements (PPMS), and Mossbauer spectroscopy. The synthesized nanoparticles are single-phase, without additional impurities, have a narrow size distribution and are in the superparamagnetic phase. From the (XRD) measurements, it was found that with an increase in the Zn content from x=0 to x=1.0, the sizes of the nanoparticles were increasing from 17 to 33 nm. Analysis of the Mossbauer spectroscopy data showed that when doped with Zn ions from x=0 to x=1.0, the sizes of the nanoparticles were decreasing from 15 nm to 5 nm. The results of the Mossbauer studies showed that both ZnxFe3-xO4 and ZnxFe3-xO4@PAA has a core/shell type structure in which the core is magnetically ordered, whereas the shell does not have magnetic ordering. Mossbauer studies indicate that the coating of citric acid particles leads to their isolation from each other (i. e., a decrease in the thickness of the paramagnetic shell, and due to this to increasing in the diameter of the core). This (the last sentense) sentense is too long. It could be mode two or three sentences for better clarification. Keywords: ferrite-spinel nanoparticles, hydrothermal synthesis, polyacrylic acid functionalization, Mossbauer spectroscopy, properties, crystal and magnetic structure.

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“…Note that the experimental MS Zn x Fe 3−x O 4 (Fig. 7, a) are similar to those obtained, e. g. in [38,[52][53][54][55][56][57][58] and reference therein. The dots in Fig.…”

Section: Mossbauer Studies Of Mnps Znsupporting

confidence: 87%

supporting

confidence: 87%

Section: Sem and Edx Resultsmentioning

confidence: 99%

Section: Sem and Edx Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Zn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=- (0 ≤ x≤ 1.0) magnetic nanoparticles functionalized with polyacrylic acid (PAA)

et al. 2022

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“…Both were in a proportion of 45.5 w% and 54.5 w%, in that order. These signals are called doublets and are generally present in species that contain magnetic iron [37]. Based on the parameters of Mössbauer doublets, the Fe 2+ fraction was related to fayalite species (Fe 2+ ) 2 SiO 4 with a chemical isomer shift of 1.13 mm/s [38].…”

Section: Xps Analysis X-ray Photoelectron Spectroscopy Analysismentioning

confidence: 99%

Photo-Fenton Degradation of RB5 Dye in Aqueous Solution Using Fe Supported on Mexican Natural Zeolite

Domenzain-Gonzalez

Castro-Arellano

Galicia‐Luna

et al. 2019

International Journal of Photoenergy

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A Mexican natural zeolite (MNZ) was impregnated with Fe at concentrations of 5 and 10 mg FeCl3/g MNZ (MNZ/Fe) in order to study the photo-Fenton degradation of Reactive Black 5 (RB5) dye. Two samples were prepared and calcined at 550 and 700°C for each concentration. These samples were also characterized by the following techniques: X-ray diffraction (XRD) to determine crystalline phases of mineral, X-ray photoelectron spectroscopy (XPS) to observe the elemental composition of the material where the main element was Fe as Fe2p, Mössbauer to establish the phases in the material which were magnetite (Fe3O4), fayalite, and chlorite, Raman to corroborate that magnetite clusters in natural material were presented, and transmission electron microscopy (TEM) by which magnetite nanoparticles were observe on zeolite surface. Afterwards, the catalytic degradation of RB5 dye was performed by photo-Fenton process using a 2.2 W lamp as a radiation source. Four initial concentrations of RB5 dye ((RB5)0) were evaluated which ranged from 40 to 100 mg/L. Then, the evaluation reaction was carried out by UV-Vis spectroscopy to know the change in RB5 concentration and chemical oxygen demand (COD) removal to determine the organic carbon. The best results on the photo-Fenton degradation was 91% discoloration and 68.5% chemical oxygen demand removal based on an initial concentration RB50=100 mg/L and 10 mg MNZ/Fe (700°C of calcined temperature) at MNZ/Fe=0.05 g/L catalyst dose in aqueous solution, H2O2=3 g/L, pH=2.5, and 180 minutes of reaction time. Subsequently, variations on (RB5)0, pH, (H2O2), and (MNZ/Fe) were assessed in order to optimize the process by keeping 10 MNZ/Fe. The optimal RB5 dye degradation was achieved at RB50=100 mg/L in the presence of MNZ/Fe=0.2 g/L, H2O2=3 g/L and pH=2.5 where the highest discoloration and chemical oxygen demand removal were 93 and 70.5 at 180 min. Finally, the kinetic reaction was evaluated as a pseudo-first-order kinetics with an apparent rate constant (kapp) of 0.0225 min-1 at latest conditions.

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Structural and phase transformations during copper and iron mechanical alloying in liquid medium studied by Mössbauer spectroscopy

et al. 2016

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Mössbauer spectroscopy analysis of the phase composition of iron-based nanoparticles

Cited by 9 publications

References 4 publications

Zn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=- (0 ≤ x≤ 1.0) magnetic nanoparticles functionalized with polyacrylic acid (PAA)

Zn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=- (0 ≤ x≤ 1.0) magnetic nanoparticles functionalized with polyacrylic acid (PAA)

Photo-Fenton Degradation of RB5 Dye in Aqueous Solution Using Fe Supported on Mexican Natural Zeolite

Structural and phase transformations during copper and iron mechanical alloying in liquid medium studied by Mössbauer spectroscopy

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