Exploring the magnetic and structural properties of Nd-doped Cobalt nano-ferrite for permanent magnet applications

Mounkachi, O.; Lamouri, R.; Abraime, B.; Ez‐Zahraouy, H.; Kenz, A. El; Hamedoun, M.; Benyoussef, A.

doi:10.1016/j.ceramint.2017.07.209

Cited by 54 publications

(13 citation statements)

References 27 publications

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“…The pure cobalt showed high value of remanence (34 emu/g) at RT which well-fitted the requirements of permanent magnets [87]. Additionally, the M r decreased for Zn 2+ substituted samples (Fig.…”

Section: Magnetic Propertiessupporting

confidence: 70%

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

Maksoud

Elghandour

El-Sayyad

et al. 2020

J Inorg Organomet Polym

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This work reports the detailed structural characterization of Zn 2+ ion-substituted cobalt ferrite nanoparticles (CFO NPs; Co 1−x Zn x Fe 2 O 4 ; x = 0.00, 0.25, 0.50, and 0.75), prepared using a facile sol-gel method. It correlates structural changes with magnetic and dielectric properties. The as-synthesized samples were investigated by X-ray diffraction (XRD) analysis, BET surface area analyzer, energy-dispersive X-ray (EDX), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), Mössbauer spectroscopy, and impedance analyzer. The pristine sample (CFO) comprised of NPs with 25 nm size, which decreased up to 11 nm upon the formation of Zn 0.75 Co 0.25 Fe 2 O 4 . The N 2 adsorption-desorption isotherm of the prepared Zn 0.5 Co 0.5 Fe 2 O 4 sample confirmed the presence of a mesoporous structure. SEM images revealed that all prepared samples exhibited porous surface with honeycomb-like structures. The cationic distribution was described by Mössbauer spectra. The increment of Zn ions in the prepared samples resulted in sharp reduction of saturation magnetization and remanence values. The normal dielectric dispersion behavior was recorded and can be ascribed to the Maxwell-Wagner type polarization. Besides, the dielectric parameters varied by increasing Zn content in CFO NPs. This may be ascribed to O 2 vacancies and Fe 3+ ions in A-and B-sites. Dielectric studies revealed that, content of Zn ions beyond x = 0.25 was sufficient to reduce both dielectric constant and loss at low frequencies.

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Section: Magnetic Propertiessupporting

confidence: 70%

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

Maksoud

Elghandour

El-Sayyad

et al. 2020

J Inorg Organomet Polym

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“…From the (BH) max versus H plot in Figure b, we have obtained the maximum value of 2.4 MGOe for C-2. To the best of our knowledge, this (BH) max product at room temperature exceeds the values previously reported for CoFe 2 O 4 . , We have compared the (BH) max value of C-2 with other reports, and a comparative analysis is presented in Table S3. ,− …”

Section: Resultsmentioning

confidence: 55%

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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“…They also have higher coercive field relative to those for the mass-produced metal magnet types and this allows them to be made into shapes involving high demagnetizing fields. According to the hysteresis loop, Co0.5Nd0.5Fe2O4 has a maximum energy product (BH) max of 0.431 MG Oe (3.434 KJ/m 3 ) at room temperature, which is a 7 percent increase above pure cobalt ferrites nanoparticles, confirming the material's performance in permanent magnet applications [194].…”

Section: Permanent Magnetsmentioning

confidence: 84%

Recent Advances in Processing, Characterizations and Biomedical Applications of Spinel Ferrite Nanoparticles

Kumar

Katoch

2021

Materials Research Foundations

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Many researchers are interested in investigating ceramic materials because of the potential for their use in nanotechnology. Spinel ferrites are a diverse group of materials with many applications. Electronic devices such as inductors, power, information storage, microwave, and induction tuners are only a few examples. As ferrite materials exhibit super-paramagnetic activity, their potential for biological applications such as drug delivery, hyperthermia, and resonance magnetic imaging. As a result, super-paramagnetism is a highly desirable property in spinel ferrites. Due to the size dependence, the methodologies used to synthesis of these materials have emerged as a critical step in achieving the desired properties. Many synthesis strategies have been developed in this regard such as sol-gel, co-precipitation, solid-state, solution combustion method and so on. As a result, this study provides a historical overview of spinel ferrites, as well as key principles for comprehending their various characterization techniques and properties. Recent developments in the synthesis and applications of spinel ferrites are also discussed.

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Exploring the magnetic and structural properties of Nd-doped Cobalt nano-ferrite for permanent magnet applications

Cited by 54 publications

References 27 publications

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

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

Recent Advances in Processing, Characterizations and Biomedical Applications of Spinel Ferrite Nanoparticles

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