Crystalization in Spinel Ferrite Nanoparticles

Naseri, Mahmoud; Saion, Elias

doi:10.5772/35731

Cited by 13 publications

(7 citation statements)

References 62 publications

(67 reference statements)

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“…Ferrites crystallize in three crystal types [3][4][5], but the focus will be on spinel nano-ferrites because of their electronic, optical, electrical, magnetic and catalytic properties. Moreover, the majority of the important ferrites are spinel ferrites [6].…”

Section: Introductionmentioning

confidence: 99%

Electrical and Magnetic Properties of Mg-Cr and Co-Cr Nano Ferrites Synthesized by Citrate-Gel Method

Raghasudha

Ravinder

Veerasomaiah

2015

SSP

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The work deals with the study of electrical and magnetic properties of Magnesium-Chromium and Cobalt-Chromium nanoFerrites for their potential applications synthesized by Citrate-Gel auto-combustion method. Structural Characterization of prepared nanoferrites was performed using XRD, SEM, EDS and TEM. XRD patterns confirmed the formation of homogeneous single phased cubic spinel belonging to the space group Fd3m (in agreement with ICSD Ref. data). It is found that crystallite size of Mg-Cr ferrites was in the range of 7-23nm and that of Co-Cr nanoferrites in the range of 6-12 nm. Structural morphology of both the ferrites was studied by SEM (Scanning Electron Microscopy) and TEM (Transmission Electron Microscopy). Elemental compositional analysis was carried out by EDS.Electrical properties such as D.C. resistivity of prepared Mg-Cr and Co-Cr nanoferrites were studied by two probe method. The dielectric measurements as a function of frequency at room temperature were performed in the frequency range of 20Hz to 2MHz using LCR meter. Various dielectric parameters like dielectric constant (ε′), dielectric loss (ε′′) and dielectric loss tangent (tan δ) were measured as a function of frequency. The magnetization measurements of the prepared nanoferrite samples were carried out at room temperature in the applied field of ±15KOe using Vibrating Sample Magnetometer (VSM). From the obtained M-H loops, various magnetic parameters such as Saturation Magnetization (Ms), Coercivity (Hc) and Remanence Magnetization (Mr) were measured. Magnetization as a function of field (±10T) at 5K, 25K, 300K temperatures was measured using VSM. Super-paramagnetic nature of some specified samples in Mg-Cr nanoferrites system was investigated from the temperature dependence of both the field cooled (FC) and the zero-field cooled (ZFC) magnetization measurements under a field of 100 Oe in the temperature range 5K to 350K.From the results of D.C. resistivity measurements it is observed that the resistivity decreases with increase in temperature for both Mg-Cr and Co-Cr nanoferrites suggesting the semiconducting behavior of the samples. Dielectric measurements suggest that the conduction in the ferrite systems may be due to the polaron hopping mechanism. The low loss tangent values at high frequency show the potential applications of these materials in high frequency microwave devices. Mg-Cr nanoferrites were synthesized yielding narrow hysteresis loops which are the characteristic of very soft magnetic materials that are desirable for their utility in Transformers, Inductor cores, Microwave devices and Magnetic shielding. Hysteresis loops of Co-Cr nanoferrites show the medium hard magnetic behavior of the materials. MgFe2O4 shows superparamagnetic behavior above room temperature and MgCr0.9Fe1.1O4 shows superparamagnetic behavior with the blocking temperature 94.5K. Hence these nanoferrites find applications in targeted drug delivery and in Magnetic Resonance Imaging (MRI) in biomedical field. The observed results can be explained in detail on the basis of composition and crystallite size.Contents of Paper

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Section: Introductionmentioning

confidence: 99%

Electrical and Magnetic Properties of Mg-Cr and Co-Cr Nano Ferrites Synthesized by Citrate-Gel Method

Raghasudha

Ravinder

Veerasomaiah

2015

SSP

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Section: Resultsmentioning

confidence: 99%

“…PMMA, as a macromolecule in the nanocomposite, is capable of reacting with primary amines of the BB dye due to an electron donor (N) present in the primary amine. 49,50 Another interaction for enhancing the adsorption capacity of Zn 0.5 Mn 0.5 Fe 2 O 4 -PMMA is p-p bond interaction between dyes and adsorbent molecules, but also accelerates and enhances adsorption with higher efficiency. Beyond that, this hybrid prevents the agglomeration of the Zn 0.5 Mn 0.5 Fe 2 O 4 spinel ferrite and enhances its long-term stability in aqueous solutions.…”

Section: Adsorptionmentioning

confidence: 99%

Application of the Zn_0.5Mn_0.5Fe₂O₄–PMMA nanocomposite for efficient removal of complex organic pollutants

Arámbula,

Mohammadi,

Mahdaviarab

et al. 2023

New J. Chem.

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“…The larger surface area could reduce the anisotropic energy of the nanocomposites and generate a single domain. [62] 2…”

Section: Vibrating Sample Magnetometer Studiesmentioning

confidence: 99%

Bifunctional manganese ferrite nanoparticles: Tuning their efficiency for aniline polymerization and polyaniline nanocomposites for boosting adsorption of organic dyes

Gemeay

El‐Helaly

Elsheikh

et al. 2022

J Chinese Chemical Soc

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The uniqueness of this work is the comparison of manganese ferrites/ polyaniline (Mn x Fe 3 À x O 4 /PANI) produced using K 2 S 2 O 8 as an oxidant for aniline with the efficacy of spinel manganese ferrite with various Mn 2+ ratios for the polymerization of aniline. The structural and morphological properties of the nanocomposites were characterized by thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), vibrating sample magnetometer (VSM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), and Brunauer-Emmett-Teller (BET) techniques. XRD results confirmed the formation of a single-phase cubic spinel structure with a lattice constant of approximately 8.3 Å. The surface enriched by Mn 2+ exhibited an enhanced valence of +3 and +4, increased lattice oxygen content, facilitated ferrite reduction, and improved the oxidative performance of Fe 3+ . The saturation magnetization decreased with an increase in Mn +2 ratios and PANI contents. The nanocomposites exhibited excellent adsorption of Lanaset Brown B dye, which was investigated as a model textile dye. Various adsorption capacities (q max ) for the nanocomposites were calculated in a range of 122.39-215 mg/ g, depending on the synthesis conditions. Optimization parameters, such as pH, adsorbent dose, and initial concentration, as well as reusability, were described. The Langmuir isotherm is a better model for describing the adsorption process of the nanocomposites. An evaluation of thermodynamic parameters suggests the sorption process is feasible, spontaneous, and endothermic. K E Y W O R D S adsorption, green synthesis, Lanaset Brown B dye, Mn x Fe 3Àx O 4 /PANI, polyaniline nanocomposites

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Crystalization in Spinel Ferrite Nanoparticles

Cited by 13 publications

References 62 publications

Electrical and Magnetic Properties of Mg-Cr and Co-Cr Nano Ferrites Synthesized by Citrate-Gel Method

Electrical and Magnetic Properties of Mg-Cr and Co-Cr Nano Ferrites Synthesized by Citrate-Gel Method

Application of the Zn_0.5Mn_0.5Fe₂O₄–PMMA nanocomposite for efficient removal of complex organic pollutants

Bifunctional manganese ferrite nanoparticles: Tuning their efficiency for aniline polymerization and polyaniline nanocomposites for boosting adsorption of organic dyes

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Crystalization in Spinel Ferrite Nanoparticles

Cited by 13 publications

References 62 publications

Electrical and Magnetic Properties of Mg-Cr and Co-Cr Nano Ferrites Synthesized by Citrate-Gel Method

Electrical and Magnetic Properties of Mg-Cr and Co-Cr Nano Ferrites Synthesized by Citrate-Gel Method

Application of the Zn0.5Mn0.5Fe2O4–PMMA nanocomposite for efficient removal of complex organic pollutants

Bifunctional manganese ferrite nanoparticles: Tuning their efficiency for aniline polymerization and polyaniline nanocomposites for boosting adsorption of organic dyes

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Application of the Zn_0.5Mn_0.5Fe₂O₄–PMMA nanocomposite for efficient removal of complex organic pollutants