Structural and physical property study of sol–gel synthesized CoFe 2−x Ho x O 4 nano ferrites

Patankar, Ketaki K.; Ghone, Deepali M.; Mathe, V. L.; Kaushik, S. D.

doi:10.1016/j.jmmm.2018.01.039

Cited by 24 publications

(3 citation statements)

References 22 publications

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“…The spinel ferrites have a cubic unit cell containing 56 atoms, where 32 of them are oxygen anions, and the other 24 atoms are metallic cations of which only eight occupy tetrahedral sites (A-site) while the other 16 atoms occupy octahedral sites (B-site) [ 12 , 13 ]. Among spinel ferrite nanoparticles, pure cobalt ferrite and its substituted compounds have attracted the considerable attention of numerous researchers in recent decades due to the reliable saturation magnetization ( M s ) [ 14 ], moderate magnetocrystalline anisotropy ( K ) [ 15 , 16 ], high coercivity ( H c ) [ 17 ], high Curie temperature ( T c ) [ 18 ], and thermal stability [ 19 , 20 ]. It is accepted that the chemical, electrical, and magnetic properties of cobalt ferrite nanoparticles are dependent on the chemical composition, cation distribution in the two sub-lattices of A- and B-sites, morphology, surface properties, and preparation method [ 21 , 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Zinc and Vanadium Co-Substituted CoFe2O4 Nanoparticles Synthesized by Using the Sol-Gel Auto-Combustion Method

et al. 2022

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In recent years, cobalt ferrite has attracted considerable attention due to its unique physical properties. The present study aimed to produce cobalt ferrite magnetic nanoparticles doped with zinc and vanadium using the sol-gel auto-combustion method. For this purpose, Co1-xZnxFe2-yVyO4 (where x = 0.0, 0.1, 0.2, 0.5 and y = 0.00, 0.05, 0.15, 0.25) precursors were calcined at 800 °C for 3h. The prepared samples were characterized with the X-ray diffraction (XRD) method in combination with Rietveld structure refinement, field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), and vibrating sample magnetometery (VSM). The XRD patterns confirmed the formation of crystalline spinel structure for all samples. However, the diffraction peaks of hematite and iron vanadium oxide phases were observed in the patterns of some doped samples. The average crystallite size for all the synthesized samples was found to be in the range of ~45–24 nm, implying that it decreased by simultaneously doping cobalt ferrite with Zn and V. The FT-IR spectrum confirmed the formation of the spinal structure of ferrite through the observed vibrational bands assigned to the tetrahedral (υ2) and octahedral (υ1) interstitial complexes in the spinel structure. The FE-SEM images showed that morphology, average grain size, and agglomeration of the synthesized powders were affected by doping, which was due to the interactions of the magnetic surface of nanoparticles. The VSM curves demonstrated that saturation magnetization and coercivity values changed in the range of 30–83 emu/g and from 27–913 Oe, respectively. These changes occurred due to the alteration in cation distribution in the spinel structure. This can be attributed to the change in superexchange interactions between magnetic ions by co-substitution of Zn and V ions in Cobalt ferrite and the changes in magnetocrystalline anisotropy.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Zinc and Vanadium Co-Substituted CoFe2O4 Nanoparticles Synthesized by Using the Sol-Gel Auto-Combustion Method

et al. 2022

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“…In sol-gel auto combustion synthesis [94,95], a sol is prepared by polymerization or hydrolysis reactions through addition of appropriate reagents in the precursor solution. Then, the gelation process is conducted through polymer addition or sol condensation to gel.…”

Section: Sol-gel Auto Combustion Methodsmentioning

confidence: 99%

Magnetic Metal Oxide-Based Photocatalysts with Integrated Silver for Water Treatment

et al. 2022

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In this review, the most recent advances in the field of magnetic composite photocatalysts with integrated plasmonic silver (Ag) is presented, with an overview of their synthesis techniques, properties and photocatalytic pollutant removal applications. Magnetic attributes combined with plasmonic properties in these composites result in enhancements for light absorption, charge-pair generation-separation-transfer and photocatalytic efficiency with the additional advantage of their facile magnetic separation from water solutions after treatment, neutralizing the issue of silver’s inherent toxicity. A detailed overview of the currently utilized synthesis methods and techniques for the preparation of magnetic silver-integrated composites is presented. Furthermore, an extended critical review of the most recent pollutant removal applications of these composites via green photocatalysis technology is presented. From this survey, the potential of magnetic composites integrated with plasmonic metals is highlighted for light-induced water treatment and purification. Highlights: (1) Perspective of magnetic properties combined with plasmon metal attributes; (2) Overview of recent methods for magnetic silver-integrated composite synthesis; (3) Critical view of recent applications for photocatalytic pollutant removal.

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“…Stipulations of preparation and synthesis significantly impact the value of divalent metal ions in these sites. 26 Regarding RE substituted ferrites, the orbital moment L quenching does not exist. As a result, there is a strong spin-orbit interaction between the electrons of 4 f. With RE replaced magnetite and Cobalt ferrite, the coercive field is increased.…”

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confidence: 99%

Effect of Zr, Sm and Gd Doped CoFe₂O₄ on Structural, Spectral and Magnetic Properties

M.,

N.,

et al. 2024

ECS J. Solid State Sci. Technol.

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In this work, the context is doped Rare earth elements on the structural, optical and magnetic properties of the cobalt ferrite nanoparticles using sol-gel synthesis by calcinating at 500oC for 4 hours in air. Rietveld assessment of XRD data validated the formation of a single phase cubic spinal configuration for all formations coupled with magnetic properties and were investigated. SEM has been used to study the surface morphology of the compounds. FTIR and Raman spectra confirmed the structure with the appearance of standard modes. The Rare Earth replacement in CoFe2O4 ferrites has intense impact on magnetic properties. Hysteresis loops showed the saturation magnetisation values were increased/decreased from 55emu/gm to 25 emu/gm by inserting the Rare Earth (RE) material in the Rare Earth CoFe2O4 ferrite samples. Magnetic hysteresis data show that the coercive force is depleted with change in Zr, Sm Gd composition but the net magnetisation of the samples are not interrelated with dopant level.

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Structural and physical property study of sol–gel synthesized CoFe 2−x Ho x O 4 nano ferrites

Cited by 24 publications

References 22 publications

Synthesis and Characterization of Zinc and Vanadium Co-Substituted CoFe2O4 Nanoparticles Synthesized by Using the Sol-Gel Auto-Combustion Method

Synthesis and Characterization of Zinc and Vanadium Co-Substituted CoFe2O4 Nanoparticles Synthesized by Using the Sol-Gel Auto-Combustion Method

Magnetic Metal Oxide-Based Photocatalysts with Integrated Silver for Water Treatment

Effect of Zr, Sm and Gd Doped CoFe₂O₄ on Structural, Spectral and Magnetic Properties

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Structural and physical property study of sol–gel synthesized CoFe 2−x Ho x O 4 nano ferrites

Cited by 24 publications

References 22 publications

Synthesis and Characterization of Zinc and Vanadium Co-Substituted CoFe2O4 Nanoparticles Synthesized by Using the Sol-Gel Auto-Combustion Method

Synthesis and Characterization of Zinc and Vanadium Co-Substituted CoFe2O4 Nanoparticles Synthesized by Using the Sol-Gel Auto-Combustion Method

Magnetic Metal Oxide-Based Photocatalysts with Integrated Silver for Water Treatment

Effect of Zr, Sm and Gd Doped CoFe2O4 on Structural, Spectral and Magnetic Properties

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Effect of Zr, Sm and Gd Doped CoFe₂O₄ on Structural, Spectral and Magnetic Properties