Structural, magnetic and hyperfine characterizations of nanocrystalline Zn-Cd doped nickel ferrites

Aakash,; Nordblad, Per; Mohan, Rajendra; Mukherjee, Sayak

doi:10.1016/j.jmmm.2017.06.040

Cited by 41 publications

(23 citation statements)

References 39 publications

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“…227) space group with two interpenetrating tetrahedral (A) and octahedral (B) sublattices, containing 56 atoms in a complete unit cell and 14 atoms in the smallest Bravais cell. Tetrahedral‐coordinated (A) sites containing Fe 3+ ions surrounded by four oxygen ions form square bonds (cubic symmetry) and belong to T d point group and octahedral‐coordinated (B) sites containing both Fe 3+ , Co 2+ ions surrounded by six oxygen ions have cubic symmetry and belong to D 3d point group . Room temperature Raman spectra of all the ferrite samples are depicted in Figure .…”

Section: Resultsmentioning

confidence: 99%

“…The theoretical value of saturation magnetization ( M S ) at 0 K deceases due to increase in molecular weight ( M ) and the decrease in net magnetic moment ( μ B − μ A ) with the increment of Cu concentration in cobalt ferrite, which follows similar nature with experimentally obtained value of saturation magnetization at 5 K and room temperature. The value of observed magnetic moment per formula unit in terms of Bohr's magneton for spinel ferrite is obtained from following expression

μ_{normalT} = \frac{M_{normalS} M}{5585}

where M indicates the molecular weight of the sample and M S is the saturation magnetization, respectively. The observed magnetic moment decreases in Cu 2+ ions rich samples due to decrease in net magnetic moment at octahedral (B) sites, listed in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Tetrahedralcoordinated (A) sites containing Fe 3+ ions surrounded by four oxygen ions form square bonds (cubic symmetry) and belong to T d point group and octahedral-coordinated (B) sites containing both Fe 3+ , Co 2+ ions surrounded by six oxygen ions have cubic symmetry and belong to D 3d point group. 14,19 Room temperature Raman spectra of all the ferrite samples are depicted in Figure 4. The essential condition for a material to be Raman active is the change in polarizability with respect to nuclear displacement should be nonzero, that is, [20][21][22][23][24] The observed Raman active modes of the corresponding peaks for the samples are listed in Table 2.…”

Section: Raman Spectra Analysismentioning

confidence: 99%

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Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Ghosh

Mukherjee

2019

J Am Ceram Soc

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We have investigated the structural and magnetic properties of polycrystalline Cu‐substituted cobalt ferrite (CuxCo1−xFe2O4: x = 0.00, 0.15, 0.30, 0.45, 0.60) nanoparticles, synthesized via chemical coprecipitation method. The prepared samples were of single phase as confirmed by X‐ray diffraction analysis. The mean crystallite size ranged from 44 to 65 nm was obtained using Scherrer's formula. M‐T curves revealed that the Curie temperature of all the samples was above room temperature and it was found to decrease with increasing Cu concentration, which was supported by Mössbauer spectra. Field cooled (FC) hysteresis curves showed ferrimagnetic nature at 5 K and room temperature. It was observed that careful variation of Cu concentration in cobalt ferrite lead to weak A‐B interaction with tunable magnetic properties.

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Section: Resultsmentioning

confidence: 99%

μ_{normalT} = \frac{M_{normalS} M}{5585}

Section: Resultsmentioning

confidence: 99%

Section: Raman Spectra Analysismentioning

confidence: 99%

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Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Ghosh

Mukherjee

2019

J Am Ceram Soc

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“…Total FWHM (β) of diffraction peaks after removing the instrument broadening effects was the simple sum of the broadening due to the crystallite diameter effect and existed microstrain contribution. The overall FWHM (β) is then written as [19] β = (β size + β strain ) = λ θ + 4ε tanθ (1) where 'K' is termed as sphericity factor (0.9 for the particles having spherical shape), 'λ' is the characteristic wavelength of Cu k α x-ray, 'ε' shows the microstrain in the nanocrystals, 'D' signifies the average crystallite diameter and 'θ' is the corresponding Bragg's angle. After proper rearrangement, the equation ( 1) takes the straight-line equation format as given below [19] βcosθ = ε (4sinθ) +…”

Section: X-ray Diffraction Studiesmentioning

confidence: 99%

Tailoring the microstructural, magnetic and dielectric properties of vanadium ions substituted nickel ferrite nanocrystals

Tanbir

Ghosh

Kar

et al. 2021

J Mater Sci: Mater Electron

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This paper describes the composition-dependent microstructural, magnetic and dielectric properties of vanadium ions doped nickel ferrite nanoparticles. All the nanoferrite samples (NiV x Fe 2-x O 4 : x = 0.00, 0.05, 0.10 and 0.15) were prepared using conventional co-precipitation method. X-ray diffraction patterns verified the single cubic spinel phase formation and achievement of nano-sized ferrite particles with a homogeneous distribution, which was also supported by HRTEM micrographs. Mean crystallite diameter was seen in the range of 05 nm to 12 nm as evaluated from Williamson-Hall (W-H) curves for the different doped samples. A compressive nature microstrain was noticed in all the samples and was also seen to reduce with the enhancement of vanadium ions content. A blue shift was detected in the indirect band gap for higher vanadium doped samples. Magnetization at the saturation point as well as coercive field both were observed to reduce at room temperature with increasing vanadium concentration in nanosized nickel ferrites. Room temperature dielectric characteristics of all the synthesized samples ensured that the elementary charge conduction process was governed by the hopping of electrons. Cole-Cole plots also showed that the grain boundaries play an important task in deciding the dielectric responses.

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“…Different techniques such as the hydrothermal method [13], wet chemical method [14][15][16][17][18], solution combustion method [19][20][21] and spray drying [22] have been employed by various researchers, which lead to the formation of nanoscale Ni-Zn ferrite particles. Currently, researchers have accomplished an adequate understanding of the doped Ni-Zn ferrites [23][24][25] using different methods. To our knowledge, very few literature/reports are available in which the solution combustion process has been used to prepare nickel and Zn-doped nickel ferrites are synthesised.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and magnetic properties of Zn substituted nickel ferrite synthesised by facile solution combustion method

Kumar

Singh

Kaur

et al. 2019

Micro & Nano Letters

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This work reports the synthesis of Ni 1−x Zn x Fe 2 O 4 ferrite (where x = 0, 0.1, 0.3, and 0.5) by a facile solution combustion method, using oxalyl-dihydrazide as a fuel. Owing to stoichiometric mixing of the starting materials and dissipation of heat during the combustion process, nano-sized spinel ferrites have been synthesised. Fourier transform infrared spectroscopy studies were carried out to confirm the presence of metal-oxide bands in spinel ferrites. X-ray powder diffraction analysis confirmed the presence of a single phase cubic nanocrystalline nature of ferrite samples. Energy dispersive X-ray spectroscopy studies showed the purity of ferrite samples. The effect of Zn substitution on the magnetic properties of these ferrites is also reported here. Magnetic studies revealed that the saturation magnetisation for these ferrite powders increases up to x = 0.3 (38.73 emu/g) and then decreases. Mössbauer measurements revealed a gradual transition from a ferrimagnetic to a superparamagnetic character with increasing concentration of Zn.

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Structural, magnetic and hyperfine characterizations of nanocrystalline Zn-Cd doped nickel ferrites

Cited by 41 publications

References 39 publications

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

Tailoring the microstructural, magnetic and dielectric properties of vanadium ions substituted nickel ferrite nanocrystals

Microstructural and magnetic properties of Zn substituted nickel ferrite synthesised by facile solution combustion method

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