Structural, magnetic and optical properties of nanosized Ni0.4Cu0.2Zn0.4R0.05Fe1.95O4 (R = Eu3+, Sm3+, Gd3+ and Pr3+) ferrites synthesized by co-precipitation method with ultrasound irradiation

Harzali, Hassen; Marzouki, Arij; Saida, Fairouz; Megriche, Adel; Mgaidi, Arbi

doi:10.1016/j.jmmm.2018.03.062

Cited by 75 publications

(11 citation statements)

References 30 publications

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“…“ g , h , a , b ” in the formula are constants, and “ D ” is the diameter of the particles [21,31]. Therefore, as the particle size becomes larger in the single domain range, the coercive force becomes larger; and in the multidomain range, as the particle size increases, the coercive force decreases [32,33]. In the present study, the grain size of CoCr 0.2 Fe 1.8 O 4 calcined at different temperatures may lie in the single domain region or the multi-domain region, so coercivity increases initially and then decreases as the annealing temperature is increased [34].…”

Section: Resultsmentioning

confidence: 99%

Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

et al. 2018

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Cobalt-chromium ferrite, CoCrxFe2−xO4 (x = 0–1.2), has been synthesized by the sol-gel auto-combustion method. X-ray diffraction (XRD) indicates that samples calcined at 800 °C for 3 h were a single-cubic phase. The lattice parameter decreased with increasing Cr concentration. Scanning electron microscopy (SEM) confirmed that the sample powders were nanoparticles. It was confirmed from the room temperature Mössbauer spectra that transition from the ferrimagnetic state to the superparamagnetic state occurred with the doping of chromium. Both the saturation magnetization and the coercivity decreased with the chromium doping. With a higher annealing temperature, the saturation magnetization increased and the coercivity increased initially and then decreased for CoCr0.2Fe1.8O4.

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Section: Resultsmentioning

confidence: 99%

Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

et al. 2018

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“…Moreover, the PL spectrum nature of Ni0.2Mg0.2Zn0.6Fe2O4 spinel ferrite depends on the complexing agents used in sol-gel method. Figure 13 [56]. The blue emission may be due to the radiative defects related to the interface traps existing at the grain boundaries [57].…”

Section: Photoluminescence Spectramentioning

confidence: 99%

The structural, magnetic, and optical properties of Ni–Mg–Zn ferrite prepared with different complexing agents via sol–gel method

Zhang

Sun

Suonan

2021

J Mater Sci: Mater Electron

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Different complexing agents were used to prepare Ni-Mg-Zn ferrite with the composition formula Ni0.2Mg0.2Zn0.6Fe2O4 via sol-gel method, which included citric acid, oxalic acid, egg white and EDTA. The Ni0.2Mg0.2Zn0.6Fe2O4 ferrite with no complexing agent was also prepared as a comparison. The chemical phases of samples were analyzed by the X-ray diffraction (XRD), which indicated that samples had spinel phase structure. The lattice constants of samples are in the range of 8.3980~8.4089 Å. The composition and structure were further studied by fourier transform infrared spectroscopy (FTIR). There were two typical characteristic bands related to the stretching vibrations of spinel ferrite in FTIR spectra. Scanning electron microscope (SEM) micrographs and transmission electron microscope (TEM) images showed that the particles have the shape of spherical cube. Energy dispersive spectrometer (EDS) analyzed the elements and ingredients of samples, which included Ni, Mg, Zn, Fe and O. X-ray photoelectron spectroscopy (XPS) is used to examine further the elemental composition and chemical state of sample prepared with EDTA as complexing agent. The optical properties of samples were investigated by photoluminescence spectra and UV-Vis spectroscopy. Vibrating sample magnetometer (VSM) was used to characterize magnetic properties, hysteresis loops revealed the ferrimagnetism behavior of prepared samples.

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“…The coercivity was found to decrease which can be attributed to the decrease of magnetocrystalline anisotropy, as Cr has a negative magnetocrystalline anisotropy [15]. However, the coercivity increased when x ≥ 0.4, due to influence by many factors, such as impurity phase, crystallinity, microstrain, magnetic particle morphology and size distribution, anisotropy, and magnetic domain size [16][17][18].…”

Section: Magnetic Property Of Particlesmentioning

confidence: 98%

“…The coercivity in the single domain region is expressed as H C = g − h/D 2 . In the multidomain region the variation of the coercivity with grain size can be expressed as in H C = a + b/D, where g, h, a, and b are constants and D is the diameter of the particle [17,18]. Hence, in the single domain region, the coercivity increased with an increase in the grain size, while in the multidomain region the coercivity decreased as the particle diameter increased.…”

Section: Magnetic Property Of Particlesmentioning

confidence: 99%

Structural and Magnetic Studies of Cr3+ Substituted Nickel Ferrite Nanomaterials Prepared by Sol-Gel Auto-Combustion

Lin

et al. 2018

Crystals

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The present study envisages the preparation of chromium substituted Nickel ferrite NiCrxFe2−xO4 (x = 0~1.0) powders by a sol-gel auto-combustion method. X-ray diffraction analysis (XRD) showed that the specimens with x > 0.2 exhibited a single-phase spinel structure, and that more content of Cr within a specimen is favorable for the synthesis of pure Ni-Cr ferrites. The lattice parameter decreased with an increase in the Cr concentration. The sample without calcining exhibited a good crystallinity. Scanning Electron Microscopy (SEM) showed the formation of ferrite powders nano-particles, and that the substitution of Cr weakened the agglomeration between the particles. Mössbauer spectra of NiCrxFe2−xO4 showed two normal Zeeman-split sextets that displayed a ferrimagnetic behavior. Furthermore, the spectra indicated that iron was in the Fe3+ state, and the magnetic hyperfine field at the tetrahedral tended to decrease with an increase in the Cr substitution. The saturation magnetization decreased by the Cr3+ ions, and reached a minimum value (Ms = 4.46 emu/g). With an increase in the annealing temperature, the coercivity increased initially, which later decreased.

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Structural, magnetic and optical properties of nanosized Ni0.4Cu0.2Zn0.4R0.05Fe1.95O4 (R = Eu3+, Sm3+, Gd3+ and Pr3+) ferrites synthesized by co-precipitation method with ultrasound irradiation

Cited by 75 publications

References 30 publications

Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

The structural, magnetic, and optical properties of Ni–Mg–Zn ferrite prepared with different complexing agents via sol–gel method

Structural and Magnetic Studies of Cr3+ Substituted Nickel Ferrite Nanomaterials Prepared by Sol-Gel Auto-Combustion

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Structural, magnetic and optical properties of nanosized Ni0.4Cu0.2Zn0.4R0.05Fe1.95O4 (R = Eu3+, Sm3+, Gd3+ and Pr3+) ferrites synthesized by co-precipitation method with ultrasound irradiation

Cited by 75 publications

References 30 publications

Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

The structural, magnetic, and optical properties of Ni–Mg–Zn ferrite prepared with different complexing agents via sol–gel method

Structural and Magnetic Studies of Cr3+ Substituted Nickel Ferrite Nanomaterials Prepared by Sol-Gel Auto-Combustion

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Structural, magnetic and optical properties of nanosized Ni0.4Cu0.2Zn0.4R0.05Fe1.95O4 (R = Eu3+, Sm3+, Gd3+ and Pr3+) ferrites synthesized by co-precipitation method with ultrasound irradiation