Structural and magnetic properties of nanocrystalline stannic substituted cobalt ferrite

Abbas, Y.; Mansour, Shehab A.; Ibrahim, Mohamed S.; Ali, Shehab E.

doi:10.1016/j.jmmm.2012.04.010

Cited by 24 publications

(10 citation statements)

References 9 publications

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“…We do not deconvolute the high-spin Fe2p spectra through multiplet splitting patterns because of the binding energy complexity associated with the overlapping subspectra of ferric and ferrous ions. 47,48 Also, the degree of covalency for B site cations is known to be lower than that of A site cations. Fig.…”

Section: Xps Determination Of Cation Sites and Discussionmentioning

confidence: 99%

“…It is difficult to discriminate them qualitatively, much less determine their location. 47,48 Electron transfer is easy between Fe 3+ and Fe 2+ in adjacent octahedral sites. 7(c) shows that the Co2p 3/2 and Co2p 1/2 main binding energies are observed at 781.5 AE 0.1 eV and 797.3 AE 0.1 eV, respectively, with their corresponding satellites.…”

Section: Xps Determination Of Cation Sites and Discussionmentioning

confidence: 99%

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Solvothermal synthesis of Co_xFe_3−xO₄ spheres and their microwave absorption properties

et al. 2014

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Co x Fe 3Àx O 4 (x ¼ 0-1) spheres are synthesized via a solvothermal reaction using ethylene glycol (EG) as a solvent. They are characterized, and the results show that the prepared spheres are mainly 300-500 nm in diameter and constituted by small grains. For the EG solution containing stoichiometric ingredients (atomic ratio of Co 2+ : Fe 3+ ¼ 1 : 2), the obtained spheres are Co 0.9 Fe 2.1 O 4 at 200 C (sphere A) andCo 0.74 Fe 2.26 O 4 (sphere B) at 300 C, whose crystallites are 23 nm and 30 nm in size, respectively. VSM measurements reveal improved properties with sphere B. Variations of complex permittivity and permeability for different composite (75% mass ratio of spheres) have been studied as a function of frequency. The calculated reflectivity value indicates that the composite containing sphere A displays better microwave absorption capability. The minimum reflection loss reaches À41.089 dB at 12.08 GHz, with a matching thickness of 2 mm. The dielectric loss contributes even more than magnetic loss in the frequency range of 3-14 GHz. The synergistic effect of dual losses makes the submicrosphere a promising absorbent in X and Ku bands. The composite consisting of sphere B is inferior in dielectric properties owing to ferrous ion migration from octahedral to tetrahedral sites and due to the big crystallites lacking defects. After the calcination treatment of the spheres at 700 C, the dielectric loss turns out to be low due to the disappearing Fe 2+ 4 Fe 3+ pairs in adjacent octahedral sites and the loss of defects. Variations of the cobalt ratio in spheres can change the resonance frequency and crystallinity of the spheres and ultimately the minimum reflection loss and corresponding frequency band. The microwave absorption properties of mixed magnetite and cobalt ferrite spheres are influenced by the cationic stoichiometry and crystalline integrity.

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Section: Xps Determination Of Cation Sites and Discussionmentioning

confidence: 99%

Section: Xps Determination Of Cation Sites and Discussionmentioning

confidence: 99%

Solvothermal synthesis of Co_xFe_3−xO₄ spheres and their microwave absorption properties

et al. 2014

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“…It reveals that the particles exhibited the super-ferromagnetic nature [16]. These nanosized particles form nanocluster in order to reduce the interfacial energy connecting the personage nanocrystals with the desired size of particles and are used in drug delivery applications [17]. The patterns of selective area electron diffraction (SAED) of the samples are shown in Fig.…”

Section: = ( Cos θ)∕4mentioning

confidence: 99%

“…For the site occupancy of magnetic cations at the tetrahedral along with octahedral sites define magnetization (M s ) [16]. The magnetic ability of spinel ferrites is actively dependent on the share of the various cations among (A) and (B) sites [17]. The Co 2+ -O 2− -Fe 3+ exchange interaction is very strong.…”

Section: Vsm Analysismentioning

confidence: 99%

“…These ferrite materials have been widely used in various technical applications in magnetic refrigeration, detoxification of biological fluids, magnetically controlled transport of anticancer drugs, magnetic resonance imaging contrast enhancement, magnetic cell separator, magnetic devices, switching devices, permanent magnets, hard disk, recording media, read-write heads, active component of ferrofluids, color imaging, gas-sensitive materials, etc. [16][17][18][19].In the present work, a novel co-precipitation technique is utilized for the arrangement of Co x Fe 3-x O 4 nanoferrites. The reactants utilized are modest, nonlethal and eco-accommodating.…”

Section: Introductionmentioning

confidence: 99%

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Tuning of ferrites (CoxFe3-xO4) nanoparticles by co-precipitation technique

Sagayaraj¹,

Aravazhi

kumar

et al. 2019

SN Appl. Sci.

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The synthesis of cobalt ferrites (Co x Fe 3-x O 4 ) materials with sympathetic size and tunable magnetic properties is used for the promising industrial and biomedical applications. Such cobalt ferrites nanoparticles have been employed by co-precipitation technique. XRD analysis revealed that the average crystallite size of synthesized powder is 9 nm using (311) peaks, and it has exhibited polycrystalline structure. FTIR spectroscopy showed the formation of ferrite phase with high-and low-frequency bands at 573 cm −1 and 455 cm −1 , respectively. The TEM images exposed that the materials have been well agglomerated along with spherical-shaped nanoparticles. EDX study confirmed the presence Co, O, Fe and C with stoichiometric composition and no more impurity detected in the spectrum. The VSM analysis revealed that the sample exhibits the hard magnetic materials. In addition, the magnetic anisotropy increases (19.05 → 344.84 erg/g) when Co is added with Fe 3 O 4 . EPR spectroscopy confirmed the ferromagnetic behavior of composites.

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Role of Bi3+ substitution on structural, magnetic and optical properties of cobalt spinel ferrite

et al. 2016

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Structural and magnetic properties of nanocrystalline stannic substituted cobalt ferrite

Cited by 24 publications

References 9 publications

Solvothermal synthesis of Co_xFe_3−xO₄ spheres and their microwave absorption properties

Solvothermal synthesis of Co_xFe_3−xO₄ spheres and their microwave absorption properties

Tuning of ferrites (CoxFe3-xO4) nanoparticles by co-precipitation technique

Role of Bi3+ substitution on structural, magnetic and optical properties of cobalt spinel ferrite

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Structural and magnetic properties of nanocrystalline stannic substituted cobalt ferrite

Cited by 24 publications

References 9 publications

Solvothermal synthesis of CoxFe3−xO4 spheres and their microwave absorption properties

Solvothermal synthesis of CoxFe3−xO4 spheres and their microwave absorption properties

Tuning of ferrites (CoxFe3-xO4) nanoparticles by co-precipitation technique

Role of Bi3+ substitution on structural, magnetic and optical properties of cobalt spinel ferrite

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Solvothermal synthesis of Co_xFe_3−xO₄ spheres and their microwave absorption properties

Solvothermal synthesis of Co_xFe_3−xO₄ spheres and their microwave absorption properties