Enhanced magnetic properties of doped cobalt ferrite nanoparticles by virtue of cation distribution

Chakrabarty, Sankalpita; Dutta, Abhigyan; Pal, M.

doi:10.1016/j.jallcom.2014.10.179

Cited by 93 publications

(30 citation statements)

References 33 publications

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“…3.1. The calculated value of M r /M s of prepared samples lies between 0 and 0.5 and shows that there is magneto-static interaction between the particles [31]. The K value of Ni 0.6-x Zn 0.4 Co x Fe 2 O 4 has been calculated by using following relation (Eq.…”

Section: Magnetic Characterizationmentioning

confidence: 98%

Variation in magnetic and structural properties of Co-doped Ni–Zn ferrite nanoparticles: a different aspect

Kumar

Singh

et al. 2016

J Sol-Gel Sci Technol

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Cobalt-substituted nickel-zinc ferrite nanoparticles (Ni 0.6-x Zn 0.4 Co x Fe 2 O 4 ) (x = 0, 0.0165, 0.033, 0.264 and 0.528) have been synthesized and characterized with respect to their structural and magnetic properties. Exceptionally in spite of the reported literature where the saturation magnetization increases with Co doping that attributes to Co 2? ions distribution in octahedral sites, the saturation magnetization in our samples decreases by increasing Co contents as revealed by vibrating sample magnetometer measurements. To know the structural properties such as phase identification, measurement of crystallite size and other structural parameters, prepared samples have been performed by X-ray diffraction technique. The X-ray diffraction spectra measurements show that samples have single-phase spinel cubic structure at x = 0, 0.033, 0.264 and 0.528, and at x = 0.0165, there is partial formation of hematite phase. The uncommonly decreased saturation magnetization, variation in retentivity, coercivity and magneto-crystalline anisotropy and also variation in structural properties with Co doping are explained on the basis of Co 2? ions distribution in tetrahedral and octahedral sites in place of Ni 2? and Zn 2? ions having different magnetic moments and different ionic radii, respectively. Using transmission electron microscopy, the particles size has been calculated. The morphology and stoichiometry of prepared samples have been investigated by field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy techniques, respectively. The structural and magnetic measurement results are well co-related with each other with respect to Co 2? ions doping and its distributions. The moderate saturation magnetization and low coercivity values of all samples show soft magnetic behavior and attribute the usefulness of these materials in magnetic recording devices. Graphical Abstract

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Section: Magnetic Characterizationmentioning

confidence: 98%

Variation in magnetic and structural properties of Co-doped Ni–Zn ferrite nanoparticles: a different aspect

Kumar

Singh

et al. 2016

J Sol-Gel Sci Technol

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“…It is noted that a higher pH value may facilitate the generation of Co(OH) 2 6×10 -15 ). This is confirmed by the experiments performed by using the same volume of water and EG, but with different amount of NaOAc (0, 3.6 and 10.8 g).…”

Section: Effect Of Ph Value Of the Precursormentioning

confidence: 99%

“…The properties of cobalt ferrite are dependent on its size and chemical composition [1,2]. Owing to the ferromagnetic property, it has wide applications in many fields like drug-delivery, magnetic-storage and photo-(electro-) catalysis [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Water-assisted and surfactant-free synthesis of cobalt ferrite nanospheres via solvothermal method

Ren

et al. 2015

Journal of Alloys and Compounds

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“…Together with the chemical composition changes, the manipulation of the cation distribution on octahedral and tetrahedral sites represents another suitable strategy to control the magnetic behavior of ferrites due to the strong connection between the spinel structure and its magnetism [44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Specific Loss Power of Co/Li/Zn-Mixed Ferrite Powders for Magnetic Hyperthermia

Barrera

Celegato

Martino

et al. 2020

Sensors

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An important research effort on the design of the magnetic particles is increasingly required to optimize the heat generation in biomedical applications, such as magnetic hyperthermia and heat-assisted drug release, considering the severe restrictions for the human body’s exposure to an alternating magnetic field. Magnetic nanoparticles, considered in a broad sense as passive sensors, show the ability to detect an alternating magnetic field and to transduce it into a localized increase of temperature. In this context, the high biocompatibility, easy synthesis procedure and easily tunable magnetic properties of ferrite powders make them ideal candidates. In particular, the tailoring of their chemical composition and cation distribution allows the control of their magnetic properties, tuning them towards the strict demands of these heat-assisted biomedical applications. In this work, Co0.76Zn0.24Fe2O4, Li0.375Zn0.25Fe2.375O4 and ZnFe2O4 mixed-structure ferrite powders were synthesized in a ‘dry gel’ form by a sol-gel auto-combustion method. Their microstructural properties and cation distribution were obtained by X-ray diffraction characterization. Static and dynamic magnetic measurements were performed revealing the connection between the cation distribution and magnetic behavior. Particular attention was focused on the effect of Co2+ and Li+ ions on the magnetic properties at a magnetic field amplitude and the frequency values according to the practical demands of heat-assisted biomedical applications. In this context, the specific loss power (SLP) values were evaluated by ac-hysteresis losses and thermometric measurements at selected values of the dynamic magnetic fields.

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Enhanced magnetic properties of doped cobalt ferrite nanoparticles by virtue of cation distribution

Cited by 93 publications

References 33 publications

Variation in magnetic and structural properties of Co-doped Ni–Zn ferrite nanoparticles: a different aspect

Variation in magnetic and structural properties of Co-doped Ni–Zn ferrite nanoparticles: a different aspect

Water-assisted and surfactant-free synthesis of cobalt ferrite nanospheres via solvothermal method

Specific Loss Power of Co/Li/Zn-Mixed Ferrite Powders for Magnetic Hyperthermia

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