Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

Tatarchuk, Tetiana; Bououdina, M.; Macyk, Wojciech; Shyichuk, Alexander; Paliychuk, Natalia; Yaremiy, I. P.; Al-Najar, B.; Pacia, Michał

doi:10.1186/s11671-017-1899-x

Cited by 213 publications

(77 citation statements)

References 42 publications

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“…Cobalt ferrite is not completely inverse spinel structure and this also affects the theoretical calculations, resulting in mismatch in observed and calculated values. The presence of total vacancy concentration in a material can be theoretically estimated with the help of vacancy parameter (β 0 ), given by

β_{0} = [(a_{th}^{3} - a^{3}) / a_{th}^{3}]

the decrease in vacancy parameter ( β 0 ) confirmed the decrement of anion and cation vacancies . The cationic vacancies obtained from Rietveld refinement also decrease with increase in Cu 2+ ions concentration in cobalt ferrite nanoparticles.…”

Section: Resultsmentioning

confidence: 81%

“…The presence of total vacancy concentration in a material can be theoretically estimated with the help of vacancy parameter (β 0 ), given by the decrease in vacancy parameter (β 0 ) confirmed the decrement of anion and cation vacancies. 20 The cationic vacancies obtained from Rietveld refinement also decrease with increase in Cu 2+ ions concentration in cobalt ferrite nanoparticles. The detailed discussion of structural parameters extracted from XRD analysis and cationic distributions has been included in the supplemental materials section.…”

Section: X-ray Diffraction and Structural Studiesmentioning

confidence: 91%

“…14,19 Room temperature Raman spectra of all the ferrite samples are depicted in Figure 4. The essential condition for a material to be Raman active is the change in polarizability with respect to nuclear displacement should be nonzero, that is, [20][21][22][23][24] The observed Raman active modes of the corresponding peaks for the samples are listed in Table 2. Pure CoFe 2 O 4 in nano size contains five peaks with their maxima at 294, 462, 553, 608, and 673 cm −1 , respectively.…”

Section: Raman Spectra Analysismentioning

confidence: 99%

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Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Ghosh

Mukherjee

2019

J Am Ceram Soc

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We have investigated the structural and magnetic properties of polycrystalline Cu‐substituted cobalt ferrite (CuxCo1−xFe2O4: x = 0.00, 0.15, 0.30, 0.45, 0.60) nanoparticles, synthesized via chemical coprecipitation method. The prepared samples were of single phase as confirmed by X‐ray diffraction analysis. The mean crystallite size ranged from 44 to 65 nm was obtained using Scherrer's formula. M‐T curves revealed that the Curie temperature of all the samples was above room temperature and it was found to decrease with increasing Cu concentration, which was supported by Mössbauer spectra. Field cooled (FC) hysteresis curves showed ferrimagnetic nature at 5 K and room temperature. It was observed that careful variation of Cu concentration in cobalt ferrite lead to weak A‐B interaction with tunable magnetic properties.

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β_{0} = [(a_{th}^{3} - a^{3}) / a_{th}^{3}]

Section: Resultsmentioning

confidence: 81%

Section: X-ray Diffraction and Structural Studiesmentioning

confidence: 91%

Section: Raman Spectra Analysismentioning

confidence: 99%

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Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Ghosh

Mukherjee

2019

J Am Ceram Soc

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“…In recent years, new opportunities have been disclosed and numerous directions have been developed for research on these materials by manipulating their physical properties. The long-established applications of the ferrites (in thin film, bulk or nano form) are in transformer applications, solar hydrogen production, multi-layer chip inductors, high density magnetic recording, telecommunications, microwave devices, as contrast agents in magnetic resonance imaging (MRI), sensors, catalysts etc [1][2][3][4][5][6][7][8]. Moreover, the new application of spinel ferrites has been listed as photocatalysts for photocatalytic degradation of dyes [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Ali

Khan

Hossain

et al. 2020

Mater. Res. Express

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We report the synthesis of Y-substituted Mg-Zn [Mg 0.5 Zn 0.5 Y x Fe 2−x O 4 (0x0.05)] ferrites using conventional standard ceramic technique. The samples were characterized by x-ray diffraction (XRD) analysis, field emission scanning electron microscopy (FESEM), FTIR spectroscopy, UV-Vis spectroscopy and quantum design physical properties measurement system (PPMS). XRD patterns confirm the single phase cubic spinel structure up to x=0.03 and appearance of a secondary phase of YFeO 3 for higher Y contents. FESEM images depict the distribution of grains and EDS spectra confirmed the absence of any unwanted element. Completion of solid state reaction and formation of spinel structure has been revealed from FTIR spectra. The FTIR data along with lattice constant, bulk density and porosity were further used to calculate the stiffness constant (C ij ), elastic constant and Debye temperatures. Mechanical stability of all studied compositions is confirmed from C ij using Born stability conditions. Brittleness and isotropic nature are also confirmed using Poisson's ratio and anisotropy constants, respectively. The enhancement of dc electrical resistivity (10 5 Ω cm to 10 6 Ω cm) with Y content is observed. The energy band gap (increased with Y contents) is found in good agreement with dc electrical resistivity. Ferrimagnetic to paramagnetic phase change has been observed from the field dependent high temperature magnetization curves. The magnetic moments and saturation magnetization were found to be decreased with increasing temperature. The Curie temperature (T c ) has been measured from temperature dependent magnetic moment (M-T) and initial permeability (μ′ i -T) measurements and found to be in good agreement with each other. Decrease in T c with Y content is due to redistribution of cations and weakening of the exchange coupling constant. The magnetic phase transition has been analyzed by Arrott plot and found to have second order phase transition. The dc resistivity endorses the prepared ferrites are suitable for high frequency and high temperature magnetic device applications as well.Mg-Zn ferrite is one of the most used soft ferrites because of its high electrical resistivity, low cost, low dielectric loss, high mechanical hardness and superior environmental stability [13]. Mg-Zn ferrites with higher resistivity (10 6 -10 7 Ω cm) make its suitability in high frequency applications [13]. Most of (∼ 90%) Mg 2+ ions are located on the B-sites and small fraction (∼10%) occupies in the A-sites [14,15]. However, the Zn 2+ ions have a preference to occupy A-sites in the spinel lattice [16,17]. The Fe 3+ ions are distributed on both A-and B-sites [18]. Therefore, the physical properties of the Mg-Zn ferrites are determined by the cations distribution over the A-and B-sites. The physical properties can be altered by introducing the different metallic ions results the cations distribution modification on the A-and B-sites. The factors that determine cation distributions are ionic radius, charge, site preference and le...

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“…To date, wet chemistry has allowed the production of such mixed Co ferrite NPs, yet only substituted by either Zn or Gd, but not simultaneously. A rapid overview of the relevant literature shows that chemically made (Co 1 − x Zn x )Fe 2 O 4 nanocrystalline solid solutions exhibit a maximal magnetization at x ranging between 0.4 and 0.5 (Sharifi and Shokrollahi, ; Tahar et al, ; Ghasemian et al, ; Tatarchuk et al, ). In the case of Co(Fe 1 − x Ln x )O 4 nanocrystalline solid solutions, the highest magnetization was obtained for Ln = Gd and x ~ 0.1, the solubility limit of Ln cations being of the same order (Tahar et al, ; Kumar et al, ).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of polyol‐made Gd³⁺‐substituted Co_0.6Zn_0.4Fe₂O₄ nanoparticles as high magnetization MRI negative contrast agents

Mnasri

Bentahar

Nowak

et al. 2019

J of Interdiscip Nanomed

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The structural, microstructural, and magnetic properties of~5-nm-sized Co 0.6 Zn 0.4 Fe 2-x Gd x O 4 nanoparticles were investigated in order to evaluate their capability to enhance the magnetic resonance imaging contrast as high magnetization agents. A focus was made on the solubility of Gd 3+ cations within the spinel lattice. By coupling X-ray diffraction to X-ray fluorescence spectroscopy, we demonstrated that only a limited fraction of Gd 3+ can substitute Fe 3+ ions into the whole crystal structure and does not exceed 6 at.-%. At this concentration, the room temperature (27°C) saturation magnetizations of the prepared superparamagnetic nanocrystals were found to be close to 80 emu g À1 .Coating these nanoparticles with hydrophilic dopamine ligands leads to the formation of 50-nm-sized clusters in water. As a consequence, relatively high r 2 /r 1 ratios of transverse to longitudinal proton relaxivities and high r 2 values were measured in the resulting colloids at physiological temperature (37°C) for an applied magnetic field of 1.41 T: 33 and 188 mM À1 sec À1 , respectively, for the richest system in gadolinium. Moreover, after incubation with healthy human model cells (fibroblasts) at doses as high as 10 μg mL À1 , they induce neither cellular death nor acute cellular damage making the engineered probes particularly valuable for negative magnetic resonance imaging contrasting.

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Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

Cited by 213 publications

References 42 publications

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Evaluation of polyol‐made Gd³⁺‐substituted Co_0.6Zn_0.4Fe₂O₄ nanoparticles as high magnetization MRI negative contrast agents

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Structural, Optical, and Magnetic Properties of Zn-Doped CoFe2O4 Nanoparticles

Cited by 213 publications

References 42 publications

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Mechanical behavior, enhanced dc resistivity, energy band gap and high temperature magnetic properties of Y-substituted Mg–Zn ferrites

Evaluation of polyol‐made Gd3+‐substituted Co0.6Zn0.4Fe2O4 nanoparticles as high magnetization MRI negative contrast agents

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Product

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Evaluation of polyol‐made Gd³⁺‐substituted Co_0.6Zn_0.4Fe₂O₄ nanoparticles as high magnetization MRI negative contrast agents