Synthesis, structural, dielectric, magnetic and optical properties of Cr substituted CoFe2O4 nanoparticles by co-precipitation method

Vadivel, M.; Babu, R. Ramesh; Sethuraman, K.; Ramamurthi, K.; Arivanandhan, M.

doi:10.1016/j.jmmm.2014.03.016

Cited by 100 publications

(31 citation statements)

References 33 publications

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“…The current decade has witnessed vast research interest in ferrites, which achieved a prime position of economic and technological importance within the family of magnetic ceramic oxides because of their excellent physical properties [1][2][3][4][5]. The physical properties of ferrites are controlled by the preparation conditions, chemical composition, sintering temperature and time, type and amount of substitutions [6].…”

Section: Introductionmentioning

confidence: 99%

Frequency and temperature dependent transport properties of NiCuZn ceramic oxide

Hossen

Hossain

2015

Materials Science-Poland

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A polycrystalline sample of ceramic oxide Ni 0.27 Cu 0.10 Zn 0.63 Fe 2 O 4 was prepared by the solid state reaction method. The sintered sample was well polished to remove any oxide layer formed during sintering and the two surfaces of the pellet were coated with a silver paste as a contact material. Among dielectric properties, complex dielectric constant (ε * = ε − jε ), loss tangent (tanδ) and ac conductivity (σ ac ) in the frequency range of 20 Hz to 2 MHz were analyzed in the temperature range of 303 to 498 K using a Wayne Kerr impedance analyzer (model No. 6500B). The experimental results indicate that ε , ε , tanδ and σ ac decrease with an increase in frequency and increase with increasing temperature. The transition temperature, as obtained from dispersion curve of ε , shifts towards higher temperature with an increase in frequency. The variation of dielectric properties with frequency and temperature shows the dispersion behavior which is explained in the light of Maxwell-Wagner type of interfacial polarization in accordance with the Koop's phenomenological theory. The frequency dependent conductivity results satisfy the Jonscher's power law, σ T (ω) = σ (o) + Aω n , and the results show the occurrence of two types of conduction process at elevated temperature: (i) low frequency conductivity, due to long-range ordering (frequency independent, region I), (ii) mid frequency conductivity at the grain boundaries (region II, dispersion) and (iii) high frequency conductivity at the grain interior due to the short-range hopping mechanism (frequency independent plateau, region III).

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Section: Introductionmentioning

confidence: 99%

Frequency and temperature dependent transport properties of NiCuZn ceramic oxide

Hossen

Hossain

2015

Materials Science-Poland

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“…[4,9] It is well known that the electric, optical and catalytic properties of the ferrites can be improved through the variation of the cations in the tetrahedral and/or the octahedral sites. [4,10,11] For example, the substitution of Fe 3+ ions with Cr 3+ ions at B site contributes to enhancing the electrical resistivity for sensors and actuator applications. [10,11] The synthesis method plays a very important role in the composition, the structure, the morphology and, implicitly, in the properties of the spinel ferrites/ substituted spinel ferrites.…”

Section: Introductionmentioning

confidence: 99%

“…[4,10,11] For example, the substitution of Fe 3+ ions with Cr 3+ ions at B site contributes to enhancing the electrical resistivity for sensors and actuator applications. [10,11] The synthesis method plays a very important role in the composition, the structure, the morphology and, implicitly, in the properties of the spinel ferrites/ substituted spinel ferrites. [12][13][14] The critical requirements of obtaining well controlled uniformity and high-purity spinel ferrites/substituted ferrites led to the development of soft chemistry routes, such as the coprecipitation, [7] the microwave assisted route, [15] the reverse and normal micelles, [16] the sol-gel method, [17] the hydrothermal route, [6] the precursor route (the thermal decomposition of multimetallic compounds).…”

Section: Introductionmentioning

confidence: 99%

Chromium Substituted Cobalt Ferrites by Glycine-Nitrates Process

Gingaşu¹,

Diamandescu²,

Mîndru³

et al. 2015

Croat. Chem. Acta

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Chromium substituted cobalt ferrites (CoFe2-xCrxO4, 0  x  2) were synthesized through solution combustion method using glycine as fuel, named glycine-nitrates process (GNP). As evidenced by X-ray diffraction data (XRD), single cubic spinel phase was formed for all CoFe2−xCrxO4 (0  x  2) series. The cubic lattice parameter (a) decreases with increasing chromium content. Room temperature 57 Fe Mössbauer spectra revealed the Fe 3+ and Cr 3+ site occupancy, the local hyperfine magnetic fields and the substitution of Fe 3+ by Cr 3+ in the lattice. Scanning electron microscopy (SEM) showed a refinement of particle size with the increase of Cr 3+ content. Magnetic measurements from 5 K to 120 K have shown a dropping in the saturation magnetization as the chromium content increases. This behaviour has been explained in terms of substitution of Fe 3+ by Cr 3+ in the cubic lattice of cobalt ferrite.

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“…They can also be used as magnetic materials, because spinel structure allows the introduction of different metallic ions, which can change the magnetic and electric properties considerably [9]. The change in cation distribution affects the physical properties of spinel ferrites [10]. For example, as it was stated by Shirtash et al [10] due to the antiferromagnetic nature of Cr 3+ ions, there is a possibility of achieving control over magnetic parameters like remanence and coercivity in developing technologically important materials by simple substitution of the A ions in AFe 2 O 4 by Cr [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…The change in cation distribution affects the physical properties of spinel ferrites [10]. For example, as it was stated by Shirtash et al [10] due to the antiferromagnetic nature of Cr 3+ ions, there is a possibility of achieving control over magnetic parameters like remanence and coercivity in developing technologically important materials by simple substitution of the A ions in AFe 2 O 4 by Cr [10,11]. The substitution of different valence-state metals results in a variety of tetrahedral (A) and octahedral (B) site distribution.…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of NiCr x Fe2−x O4 Nanoparticles Synthesized via Microwave Method

Baykal

Elmal

Sertkol

et al. 2015

J Supercond Nov Magn

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The nanocrystalline NiCr x Fe 3−x O 4 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) have been synthesized by microwaveassisted combustion method, and the effect of Cr 3+ substitution on the structural and magnetic properties of NiFe 2 O 4 was studied. Phase formation was identified by X-ray powder diffraction (XRD), which confirmed the formation of a cubic spinel structure for all the compositions. The lattice "a" of all samples decreases with the increase in Cr contents in the compositions. The elemental analysis by scanning electron microscopy-energy dispersive X-ray was in close agreement with the expected composition from the stoichiometry of the starting composition used for the synthesis. NiFe 2 O 4 and NiCr 0.2 Fe 1.8 O 4 nanoparticles (NPs) show features of superparamagnetin NPs, namely reduced and unsaturated magnetization together with the absence of coercivity.

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Synthesis, structural, dielectric, magnetic and optical properties of Cr substituted CoFe2O4 nanoparticles by co-precipitation method

Cited by 100 publications

References 33 publications

Frequency and temperature dependent transport properties of NiCuZn ceramic oxide

Frequency and temperature dependent transport properties of NiCuZn ceramic oxide

Chromium Substituted Cobalt Ferrites by Glycine-Nitrates Process

Structural and Magnetic Properties of NiCr x Fe2−x O4 Nanoparticles Synthesized via Microwave Method

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