The Composition and Magnetic Structure of Fe3O4/γ-Fe2O3 Core–Shell Nanocomposites at 300 and 80 K: Mössbauer Study (Part I)

Kamzin, A. S.; Kim, Hee-Je; Valliulin, A. A.; Al‐Omari, I. A.

doi:10.1134/s1063783420100157

Cited by 10 publications

(16 citation statements)

References 72 publications

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“…Due to high sensitivity to the nuclear hyperfine interactions, the Mössbauer spectroscopy is an effective method for the MNP studies and allows studying a dependence of the MNP properties on a particle size, a temporary measurement window and a magnetic anisotropy [41][42][43][44][45]. The important advantage of the Mössbauer spectroscopy is unambiguous identification of iron oxides, which have very close values of the crystal lattice constants, which is unavailable in other procedures.…”

Section: Methods Of Characterization Of the Co X Mn 1−x Fe 2 O 4 Mnpsmentioning

confidence: 99%

“…The important advantage of the Mössbauer spectroscopy is unambiguous identification of iron oxides, which have very close values of the crystal lattice constants, which is unavailable in other procedures. That is why the Mössbauer spectroscopy allows definitely determining the phase state, the ion distribution across the nonequivalent positions, the magnetic structure and the hyperfine interactions in ironcontaining materials [41][42][43][44][45]. If the time of oscillations of a MNP magnetization direction exceeds 10 −8 s, then the Mössbauer spectrum has an evident Zeeman sextuplet indicating a magnetically-ordered state of the substance.…”

Section: Methods Of Characterization Of the Co X Mn 1−x Fe 2 O 4 Mnpsmentioning

confidence: 99%

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Structure and properties of Co-=SUB=-x-=/SUB=-Mn-=SUB=-1-x-=/SUB=-Fe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- nanoparticles depending on the amount of Co ions (0≤ x≤ 1.0)

Kamzin

Obaidat

Narayanaswamy

et al. 2022

Physics of the Solid State

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The properties of magnetic nanoparticles (MNPs) of spinel ferrites CoxMn1-xFe2O4 (at x=0.0; 0.2; 0.3; 0.4; 0.5; 0.6; 0.8; 1.0) synthesized by chemical co-precipitation method have been studied. The studies of the synthesized CoxMn1-xFe2O4 MNPs were carried out using X-ray diffraction (XRD), Raman scattering and Mossbauer spectroscopy. The results of XRD, Raman and Mossbaur studies indicate that the obtained CoxMn1-xFe2O4 MNPs are single-phase. It was established from XRD measurements that the average size of CoxMn1-xFe2O4 crystallites is 34.86 nm for MnFe2O4 (x=0) and decreases to 14.99 nm for CoFe2O4 (x=1.0) with increasing Co ions concentration. An analysis of the Mossbaur spectra showed that the average crystallite size varies from 25 nm for MnFe2O4 (x=0) to 12 nm for CoFe2O4 (x=1.0). On the Raman spectra of CoxMn1-xFe2O4 MNPs, in the region of ~620 cm-1, splitting of the A1g line is observed, which means that the studied MNPs have a reverse spinel structure. The intensity ratio of the A1g (1) and A1g (2) peaks indicates a significant redistribution of the Co2+ and Fe3+ cations between tetra- and octahedralpositions in MNPs of the CoxMn1-xFe2O4 ferrite, which is confirmed by Mossbauer data. Mossbaur spectroscopy data indicate that the synthesized CoxMn1-xFe2O4 MNPs consist of large particles with magnetic ordering and small particles in the paramagnetic phase. With an increase in the concentration of Mn ions, the proportion of fine particles increases, which leads to a decrease in the magnetic blocking temperature. The saturation magnetization of MNPs at x=0.2 (Co0.2Mn0.8Fe2O4) is 57.41 emu/g and this sample, as was found in [V. Narayanaswamy, I.A. Al-Omari, A.S. Kamzin, B. Issa, H.O. Tekin, H. Khourshid, H. Kumar, A. Mallya, S. Sambasivam, I.M. Obaidat. Nanomaterials 11, 1231 (2021)] has the highest specific absorption rate. As shown by Mossbauer studies, this is due to the fact that these particles are in a superparamagnetic state and the magnetic blocking temperature of these MNPs is in the region of ~315 K, which is most suitable for the treatment of malignant tumors by magnetic hyperthermia. Thus, the synthesized CoxMn1-xFe2O4 MNPs are promising for biomedical applications. Keywords: spinel ferrites CoxMn1-xFe2O4, magnetic structure, superparamagnetism, Mossbauer spectroscopy, materials for biomedicine.

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Section: Methods Of Characterization Of the Co X Mn 1−x Fe 2 O 4 Mnpsmentioning

confidence: 99%

Section: Methods Of Characterization Of the Co X Mn 1−x Fe 2 O 4 Mnpsmentioning

confidence: 99%

Structure and properties of Co-=SUB=-x-=/SUB=-Mn-=SUB=-1-x-=/SUB=-Fe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- nanoparticles depending on the amount of Co ions (0≤ x≤ 1.0)

Kamzin

Obaidat

Narayanaswamy

et al. 2022

Physics of the Solid State

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“…The magnetic properties and phase state of the synthesized MNPs were investigated using Mössbauer spectroscopy, which has a high sensitivity to nuclear ultrafine interactions and allows unambiguous identification of iron oxides [14,25,26,33,34,[48][49][50], which is not available to other methods. Mössbauer spectra (MS) of the synthesized MNPs were obtained using a spectrometer with registration of gamma-quanta from the source Co 57 (Rh) in the geometry of transmission through the sample.…”

Section: Research Methods Of Mnps Znmentioning

confidence: 99%

“…In addition, synthesized MNPs can be toxic and not biologically compatible. In connection with these requirements, hybrid MNPs of the core/shell type are created, the protective shell of which is silicon dioxide [24] or biologically compatible iron oxides [25,26]. Secondly, magnetic liquids (ML), developed for introduction into a living organism, are a mixture of MNPs dispersed into an aqueous medium or other liquids.…”

Section: Introductionmentioning

confidence: 99%

Influence of functionalization with citric acid on the properties of magnetic nanoparticles Zn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=- (0≤ x≤ 1.0)

Kamzin

Caliskan

Doǧan

et al. 2022

Physics of the Solid State

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The effect of surface functionalization with citric acid on the properties of magnetic nanoparticles (MNPs) ZnxFe3-xO4 (x=0; 0.25; 0.5; 0.75; 1.0) synthesized by the hydrothermal method was studied. To study the properties of MNPs, X-ray diffractometry (XRD) and energy dispersive X-ray spectroscopy (EDS) were used. The magnetic properties of the samples and the phase state of MNPs were studied using a physical property measurement system (PPMS) and Mossbauer spectroscopy (MS). It has been established that the sizes of crystallites and the crystal lattice parameter of ZnxFe3-xO4 MNPs change with increasing Zn2+ concentration. The low values of the coercive force and the presence of a doublet on the MS indicate the presence of both ferrimagnetic and superparamagnetic components. Keywords: ZnxFe3-xO4 ferrite spinel MNPs, hydrothermal synthesis, functionalization of MNPs with citric acid, crystal structure, magnetic properties, magnetic structure.

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“…However, obtaining information on the interface magnetic structure in nanoparticles is particularly challenging. Indirect information on the magnetic structure at the interface can sometimes be inferred from magnetization, X-ray magnetic circular dichroism (XMCD), Mössbauer spectroscopy, and other techniques. − However, these techniques give information on the whole sample, thus their lack of direct spatial resolution precludes establishing a one-to-one correlation between the magnetic behavior and the structural/morphological features at the atomic scale. To obtain a straightforward correlation between the structural and magnetic interface, small angle neutron scattering (SANS) can be used, although it has been used only occasionally in bimagnetic core/shell nanoparticles. , However, SANS averages over long lateral distances (typically, the whole sample), thus certain specifics of the structural–magnetic correlation can be easily overlooked.…”

Section: Introductionmentioning

confidence: 99%

Direct Evidence of a Graded Magnetic Interface in Bimagnetic Core/Shell Nanoparticles Using Electron Magnetic Circular Dichroism (EMCD)

et al. 2021

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Interfaces play a crucial role in composite magnetic materials and particularly in bimagnetic core/shell nanoparticles. However, resolving the microscopic magnetic structure of these nanoparticles is rather complex. Here, we investigate the local magnetization of antiferromagnetic/ferrimagnetic FeO/Fe3O4 core/shell nanocubes by electron magnetic circular dichroism (EMCD). The electron energy-loss spectroscopy (EELS) compositional analysis of the samples shows the presence of an oxidation gradient at the interface between the FeO core and the Fe3O4 shell. The EMCD measurements show that the nanoparticles are composed of four different zones with distinct magnetic moment in a concentric, onion-type, structure. These magnetic areas correlate spatially with the oxidation and composition gradient with the magnetic moment being largest at the surface and decreasing toward the core. The results show that the combination of EELS compositional mapping and EMCD can provide very valuable information on the inner magnetic structure and its correlation to the microstructure of magnetic nanoparticles.

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The Composition and Magnetic Structure of Fe3O4/γ-Fe2O3 Core–Shell Nanocomposites at 300 and 80 K: Mössbauer Study (Part I)

Cited by 10 publications

References 72 publications

Structure and properties of Co-=SUB=-x-=/SUB=-Mn-=SUB=-1-x-=/SUB=-Fe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- nanoparticles depending on the amount of Co ions (0≤ x≤ 1.0)

Structure and properties of Co-=SUB=-x-=/SUB=-Mn-=SUB=-1-x-=/SUB=-Fe-=SUB=-2-=/SUB=-O-=SUB=-4-=/SUB=- nanoparticles depending on the amount of Co ions (0≤ x≤ 1.0)

Influence of functionalization with citric acid on the properties of magnetic nanoparticles Zn-=SUB=-x-=/SUB=-Fe-=SUB=-3-x-=/SUB=-O-=SUB=-4-=/SUB=- (0≤ x≤ 1.0)

Direct Evidence of a Graded Magnetic Interface in Bimagnetic Core/Shell Nanoparticles Using Electron Magnetic Circular Dichroism (EMCD)

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