Structural, electrical, magnetic and dielectric properties of rare-earth substituted cobalt ferrites nanoparticles synthesized by the co-precipitation method

Nikumbh, A.K.; Pawar, R.A.; Nighot, D.V.; Gugale, G. S.; Sangale, M. D.; Khanvilkar, M.B.; Nagawade, Arvind V.

doi:10.1016/j.jmmm.2013.11.052

Cited by 201 publications

(58 citation statements)

References 25 publications

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“…Reduction of these parameters is correlated with weakening of exchange interaction [51,64]. Same effect of RE 3+ ions induced weakening of magnetic interaction is observed for CoRExFe2−xO4 (where, RE=Nd, Sm and Gd and x=0.1 and 0.2) [17]. Presence of Dy 3+ ions results in the weak super-exchange interactions in ferrites [77].…”

Section: Change Of Exchange Interactionmentioning

confidence: 63%

“…RE compounds with RE 3+ are appropriate for doping purpose. RE 3+ ions prefer Bsite inside spinel structure [17][18][19]. RE doped ferrites deals with the following issues.…”

Section: Rare Earth (Re) Doped Ferritementioning

confidence: 99%

“…Thus, research is being carried out for doped ferrite systems in order to understand the altered behavior and to optimize them for different applications [11][12][13][14][15]. In recent years, rare earth (RE) doped ferrites become interesting due to their superiority for various applications over other doped ferrite systems [17][18][19][20][21][22]. These systems become radioactive and exhibit potentential for biomedical applications [19] along-with efficient tumor passive targeting [23].…”

Section: Introductionmentioning

confidence: 99%

“…These ferrites exhibit enhanced magneto optical kerr (MOKE) effect [20] and excellent microwave absorption properties [21,22]. Thus, these ferrites cover a wide range of applications chiefly based on their magnetic characteristics [17][18][19][20][21][22][23][24][25]. However, there is lack of understanding of magnetic interaction, conduction mechanism inside these ferrites [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Singh¹,

Kumar²,

Srivastava³

et al. 2016

Appl. Sci. Lett.

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In present review we have focused various issues like solubility limit, magnetic interaction and conduction mechanism of rare earth doped ferrite. Cumulative effects of valence state, magnetic moments of rare earth ions, weakening/strengthening of exchange interaction and magnetic ordering in rare earth ion doped ferrite are responsible for magnetic behavior. It is proposed that characterization techniques based on synchrotron radiation like X-ray absorption spectroscopy and X-ray magnetic circular dichroism can open pathways to prove these assumptions.Keywords: Rare earth, ferrites, magnetic interaction, valence state 1.INTRODUCTIONSpinel ferrites are ferrimagnetic material which have numerous technological applications [1][2][3]. Moreover, nanoparticles of these ferrites are being utilized in high-density magnetic information storage, magnetic resonance imaging, drug delivery etc. [4][5][6]. These several applications are based on magnetic and electrical behavior of ferrites [1][2][3][4][5][6]. These properties depend on various factors like, ionic radii, nature of hybridization, presence of doped atom in host lattice apart from the particle size [7][8][9][10]. Thus, research is being carried out for doped ferrite systems in order to understand the altered behavior and to optimize them for different applications [11][12][13][14][15]. In recent years, rare earth (RE) doped ferrites become interesting due to their superiority for various applications over other doped ferrite systems [17][18][19][20][21][22]. These systems become radioactive and exhibit potentential for biomedical applications [19] along-with efficient tumor passive targeting [23]. Improved capability of dye removal [24], waste water treatment [25], degradation of organic pollutants through photocatalytic activity [26] are other important fields of utilization of these ferrites. These ferrites exhibit enhanced magneto optical kerr (MOKE) effect [20] and excellent microwave absorption properties [21,22]. Thus, these ferrites cover a wide range of applications chiefly based on their magnetic characteristics [17][18][19][20][21][22][23][24][25]. However, there is lack of understanding of magnetic interaction, conduction mechanism inside these ferrites [15,16]. Thus purpose of this review article is to discuss these issues and to give prospects for future research in this direction. SPINEL FERRITEThe general formula for spinel ferrite is MO:Fe2O3 where, M is a divalent transition metal ion. Spinel name is given due to resemblance of structure of these ferrites with mineral spinel MgO.Al2O3. In this structure, oxygen ions are packed quite close together in face centred cubic arrangement and metal ions occupy spaces between them (Fig. 1). These spaces are categorized as tetrahedral (A) and octahedral (B) sites when surrounded by four and six oxygen ions respectively (Fig. 1).In a unit cell of spinel ferrite, there exists 64 and 32 A and B-sites respectively. Only 1/8 th and 1/2 th of A and B-sites are occupied [27]. Metal ions are distributed among A a...

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Section: Change Of Exchange Interactionmentioning

confidence: 63%

“…RE compounds with RE 3+ are appropriate for doping purpose. RE 3+ ions prefer Bsite inside spinel structure [17][18][19]. RE doped ferrites deals with the following issues.…”

Section: Rare Earth (Re) Doped Ferritementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Singh¹,

Kumar²,

Srivastava³

et al. 2016

Appl. Sci. Lett.

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show abstract

“…There are several methods like the hydrothermal, ceramic, auto-combustion, mechanical milling, Solgel and co-precipitation techniques by which ferrite nanoparticles are usually prepared. The co -precipitation method has more advantages than the other methods [11][12][13][14]. In our present work we have proposed to synthesize Copper substituted Calcium ferrite by co-precipitation method and to study their structural, optical, magnetic properties and photo catalytic degradation of methylene blue dye.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of organic pollutant using Copper substituted calcium ferrite

Ajeesha¹

2018

IJRASET

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The magnetic and optical properties of Ca1-xCuxFe2O4 nano ferrites have fascinated the attention of researchers. Copper substituted calcium ferrite with composition (x=0.2, 0.4, 0.6, 0.8, 1.0) was prepared by coprecipiation method. The prepared compositions were subjected to structural, optical and magnetic properties. X-ray diffraction studies reveal the formation of orthorhombic phase and the lattice constant increases with increase in calcium concentration from (x=0.2 to 0.8) Transmission Electron microscope (TEM) technique was used to study the morphology of the synthesized ferrites. The hysteresis loop confirms the magnetic behavior of the prepared composition. The adsorption and desorption measurement was studied from Brunauer-Emmett-Teller (BET) technique. The parameters such as magnetization, coercivity and retentivity are also calculated. The photocatalytic degradation of the synthesized ferrites using Methylene blue was also studied.

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Investigation of Crystallographic, Morphological, Magnetic and Electrochemical Properties of La‐Doped Cu‐CoFe₂O₄ Spinel Ferrites

Khan,

Mahajan,

Srivastava

2024

Cryst. Res. Technol.

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This research presents the successful synthesis of Cu0.79Co0.21LaxFe2‐xO4 (0.0 ≤ x ≤ 0.8) (spinel ferrite) nanoparticles via the sol‐gel auto combustion technique, with varying La3+ dopant concentrations. In this study, the estimated crystallite size (D) is found to be in the range of (27.92–40.90) nm. The microstructural parameter determination in XRD data is improved using Rietveld refinement. Fourier Transform Infrared Spectroscopy (FTIR) spectra exhibit two distinct metal stretching vibrational bands within (400–600) cm−1 range, a characteristic fingerprint region for all ferrites. Field Emission Scanning Electron Microscopy (FESEM) analysis reveals the agglomeration of particles due to magnetic interactions and non‐uniform distribution of average particle sizes ranging from (1.06–1.87) µm. Energy Dispersive X‐Ray Analysis (EDX) validates the chemical composition's accuracy. Owing to the dilution effect resulting from the introduction of non‐magnetic La3+ ions into the ferrite structure, there is a reduction in the saturation magnetization value, decreasing from 37.28 to 6.24 emu g−1 in the Vibrating Sample Magnetometery (VSM) study. The electrochemical analysis reveals the impressive electrochemical characteristics of the newly developed ferrites, highlighting a remarkable specific capacitance of 270.0 F g−1. This finding positions them as highly promising contenders for a wide range of energy storage supercapacitor applications.

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Structural, electrical, magnetic and dielectric properties of rare-earth substituted cobalt ferrites nanoparticles synthesized by the co-precipitation method

Cited by 201 publications

References 25 publications

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Photocatalytic degradation of organic pollutant using Copper substituted calcium ferrite

Investigation of Crystallographic, Morphological, Magnetic and Electrochemical Properties of La‐Doped Cu‐CoFe₂O₄ Spinel Ferrites

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Structural, electrical, magnetic and dielectric properties of rare-earth substituted cobalt ferrites nanoparticles synthesized by the co-precipitation method

Cited by 201 publications

References 25 publications

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Solubility limit, magnetic interaction and conduction mechanism in rare earth doped spinel ferrite

Photocatalytic degradation of organic pollutant using Copper substituted calcium ferrite

Investigation of Crystallographic, Morphological, Magnetic and Electrochemical Properties of La‐Doped Cu‐CoFe2O4 Spinel Ferrites

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Investigation of Crystallographic, Morphological, Magnetic and Electrochemical Properties of La‐Doped Cu‐CoFe₂O₄ Spinel Ferrites