The structural and magnetic properties of the nano-CoFe2O4 ferrite prepared by sol-gel auto-combustion technique

Maashani, Mohammed S. Al; Khalaf, Kadhim A.M.; Gismelseed, A. M.; Al‐Omari, I. A.

doi:10.1016/j.jallcom.2019.152786

Cited by 46 publications

(10 citation statements)

References 53 publications

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“…A broad absorption band detected at 3469 cm −1 is ascribed to the stretching vibrations of the O–H bond in water molecules present within the interstitial spaces of the layers. 42,57 Minute changes in the intensity and minor spectral shifts in the two primary characteristic absorption bands of the ferrites are noted, as presented in Table 2 and Fig. 3.…”

Section: Resultsmentioning

confidence: 83%

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Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Hussein,

Saafan,

Abosheiasha

et al. 2023

RSC Adv.

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Section: Resultsmentioning

confidence: 83%

“…Finally, ammonium hydroxide was added to the mix in drops while the stirring continued until the pH reached approximately 7.0. 42,43 Aer removing the magnet, the mixture was heated to about 120 °C for three hours. A formed viscous gel has been self-ignited to give a ne and brown powder of the ferrite eventually.…”

Section: Synthesismentioning

confidence: 99%

Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Hussein,

Saafan,

Abosheiasha

et al. 2023

RSC Adv.

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“…The FT-IR spectrum was recorded at room temperature for a frequency range of 400 to 1000 cm −1 . The metal-oxygen bands are observed in the FT-IR spectrum around 400 cm −1 (n 2 ) and 600 cm −1 (n 1 ) are common features of spinel ferrite [34]. The absorption band was clearly appeared at 574.79 cm −1 shows stretching vibrations of metal-oxygen bonds at the tetrahedral site and the absorption band was attributed at 414.70 cm −1 due to stretching vibrations of metal-oxygen bonds present at the octahedral site [35].…”

Section: Ft-ir Analysismentioning

confidence: 97%

Structural, morphological, and magnetic study of low temperature synthesized Co_0.75Ni_0.25Fe_1.95Dy_0.05O₄ nano ferrite

Chikhale¹,

Kanade²,

Bhatia³

2021

Phys. Scr.

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The nanoparticles of Co0.75Ni0.25Fe2−zDyzO4 (z = 0.0 and 0.05) were prepared by the sol-gel auto-combustion method. The cation distribution was calculated from the Rietveld refinement of the XRD pattern to confirm a mixed inverse spinel structure. The crystallite size was calculated by the Debye–Scherrer method, modified Scherrer method, Williamson Hall plot method, and size-strain plot method for prepared samples. The variation in crystallite size was observed due to the contribution of lattice strain on line peak broadening. From Fourier transform infrared (FT-IR) spectrum the absorption bands appeared at 574.79 cm−1 and 414.70 cm−1 reveals spinel ferrite structure for Co0.75Ni0.25Fe1.95Dy0.05O4. The particle size from a high-resolution scanning electron microscope (HR-SEM) the image was found to be 46.99 nm for Co0.75Ni0.25Fe1.95Dy0.05O4. Energy-dispersive X-ray spectrum (EDS) was confirmed the purity of the sample with good stoichiometry. The coercivity, retentivity, and saturation magnetization were estimated at 841.97 Oe, 30.95 emu g−1 and 61.80 emu g−1 respectively for Co0.75Ni0.25Fe1.95Dy0.05O4. The squareness ratio for Co0.75Ni0.25Fe1.95Dy0.05O4 nanoferrite was found to be 0.5 which is the ideal Stoner—Wohlfarth value. The experimental estimated net magnetic moment ( n B ) per formula was less than the theoretical value calculated from Neel’s two sublattice model for prepared samples.

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“…A comparison of literature reports with the magnetic parameters of our calcined CoFe 2 O 4 demonstrates the efficacy of our approach (Table S2). ,,,,− ,,,− …”

Section: Resultsmentioning

confidence: 99%

Spin Disorder and Particle Size Effects in Cobalt Ferrite Nanoparticles with Unidirectional Anisotropy and Permanent Magnet-like Characteristics

2020

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Spinel ferrites, especially cobalt ferrite, have the capability of preserving sufficient magnetization (M s) and coercive field (H c). However, precise nanostructuring is needed to sustain the steady ferrimagnetic (FiM) response with high H c and remnant magnetization (M r). By a two-step process involving co-precipitation and inert calcination, CoFe2O4 nanoparticles (NPs) with inherent lattice strain were achieved with appreciable magnetic anisotropy. The disordered spins on the NP surface are found to be the key for maintaining the anisotropy and squareness (M r/M s) of hysteresis loops, the extent of which is a function of the processing temperature and NP size. The freezing of surface spins results in 2.8 and 1.2 nm thick spin glass (SG) layers for the as-prepared and 350 °C-calcined CoFe2O4 NPs, respectively, analyzed at 5 K. The frozen surface spins pin the core FiM spins, resulting in the exchange bias (H eb) coupling. At room temperature, 20 nm NPs exhibit permanent magnet-like features with a maximum energy product, BHmax, of 2.4 MGOe, which is quite promising considering CoFe2O4 as an environmentally friendly alternative to the hazardous rare-earth-based permanent magnets. Our CoF2O4 NP ensemble delivers both intriguing low-temperature magnetic properties having academic and technological interests and worthwhile room-temperature features that have direct translational relevance.

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The structural and magnetic properties of the nano-CoFe2O4 ferrite prepared by sol-gel auto-combustion technique

Cited by 46 publications

References 53 publications

Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Structural, morphological, and magnetic study of low temperature synthesized Co_0.75Ni_0.25Fe_1.95Dy_0.05O₄ nano ferrite

Spin Disorder and Particle Size Effects in Cobalt Ferrite Nanoparticles with Unidirectional Anisotropy and Permanent Magnet-like Characteristics

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The structural and magnetic properties of the nano-CoFe2O4 ferrite prepared by sol-gel auto-combustion technique

Cited by 46 publications

References 53 publications

Crystal structure and peculiarities of microwave parameters of Co1−xNixFe2O4 nano spinel ferrites

Crystal structure and peculiarities of microwave parameters of Co1−xNixFe2O4 nano spinel ferrites

Structural, morphological, and magnetic study of low temperature synthesized Co0.75Ni0.25Fe1.95Dy0.05O4 nano ferrite

Spin Disorder and Particle Size Effects in Cobalt Ferrite Nanoparticles with Unidirectional Anisotropy and Permanent Magnet-like Characteristics

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Product

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Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Crystal structure and peculiarities of microwave parameters of Co_1−xNi_xFe₂O₄ nano spinel ferrites

Structural, morphological, and magnetic study of low temperature synthesized Co_0.75Ni_0.25Fe_1.95Dy_0.05O₄ nano ferrite