Investigation of cation distribution and magnetocrystalline anisotropy of Ni x Cu 0.1 Zn 0.9−x Fe 2 O 4  nanoferrites: Role of constant mole percent of Cu 2+  dopant in place of Zn 2+

Ramakrishna, K.; Srinivas, Ch.; Meena, Sher Singh; Tirupanyam, B. V.; Bhatt, Pramod; Yusuf, S. M.; Prajapat, C.L.; Potukuchi, D. M.; Sastry, D.L.

doi:10.1016/j.ceramint.2017.03.078

Cited by 48 publications

(12 citation statements)

References 45 publications

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“…7 It is observed that all of the nanosamples' coercivity from x = 0 to 0.12 except x = 0.1 is directly proportional to the grain sizes due to the single domain nature. 26 Due to Al doping, a thin layer of Al−O−Al structure forms around the grain and hinders grain walls' movement, 15 increasing H c for the x = 0.1 sample. Some unwanted magnetic construction, including blocked particles induced inside the nanoparticles' grains, enhances the sample's coercivity.…”

Section: Resultsmentioning

confidence: 95%

“…The saturation magnetization (M s ) was found from the extrapolation of M vs 1/H to 1/H = 0 (at the high magnetic field). 26 However, the magnetic properties of nanospinel ferrites depend on several factors, including the synthesis route, crystallite size, sintering temperature, and rearrangement of cations inside the voids. 7 In the present work, the saturation magnetization increases from 59.85 to 82.32 emu/g until the samples with x = 0.07.…”

Section: Resultsmentioning

confidence: 99%

“…The M–H loops are disclosed in Figure , and magnetic parameters are presented in Table . The saturation magnetization ( M s ) was found from the extrapolation of M vs 1/ H to 1/ H = 0 (at the high magnetic field) . However, the magnetic properties of nanospinel ferrites depend on several factors, including the synthesis route, crystallite size, sintering temperature, and rearrangement of cations inside the voids …”

Section: Results and Discussionmentioning

confidence: 99%

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Exploration through Structural, Electrical, and Magnetic Properties of Al³⁺ Doped Ni–Zn–Co Nanospinel Ferrites

2021

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The exploration of aluminum (Al3+) ion substituted nickel–zinc–cobalt (Ni–Zn–Co) nanoferrites is still at the infancy stage, although the structural, electrical, and magnetic properties have been widely investigated. Single-phase cubic nanospinel ferrites of Ni0.4Zn0.35Co0.25Fe2–x Al x O4 (0 ≤ x ≤ 0.12) with space group Fd 3m were confirmed by the Rietveld refinement X-ray diffraction (XRD) data. Lattice constants displayed a declining trend with compositions x. The average particle size was found to range from 29 to 25 nm. Selected area electron diffraction (SAED) patterns were indexed according to space group Fd 3 m , indicating that nanoparticles are well crystallized. Samples’ modes of vibrations swung between redshift and blueshifts as detected in the Raman spectra. The saturation magnetizations (M s) were in the range of 59.85–86.39 emu/g. Frequency-dependent dielectric constants (ε′) and ac resistivity (ρ) measurement suggested that samples were highly resistive. These resistive nanoferrites with high saturation magnetizations may function effectively for multifaceted electronic devices.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

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Exploration through Structural, Electrical, and Magnetic Properties of Al³⁺ Doped Ni–Zn–Co Nanospinel Ferrites

2021

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“…On the basis of XRD patterns, the average crystallite size (D) and the microstrain (ε) are two meaningful structural parameters that can be calculated using Williamson-Hall (W-H) method [39]. Using X-ray analysis supported by Rietveld refinements, important structural and physical parameters such as the experimental lattice constant, X-ray density, bulk density, the porosity percentage, and the theoretical specific surface area S (m 2 /g) were estimated [40][41][42][43]. It is well known that, FTIR analysis can shed the light on the preferred occupation sites for cations in ferrite samples by evaluating two parameters namely, the force constant at the tetrahedral sites (F t ) and the force constant at the octahedral site (F o ) as illustrated in [44].…”

Section: Theorymentioning

confidence: 99%

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

Maksoud

Elghandour

El-Sayyad

et al. 2020

J Inorg Organomet Polym

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This work reports the detailed structural characterization of Zn 2+ ion-substituted cobalt ferrite nanoparticles (CFO NPs; Co 1−x Zn x Fe 2 O 4 ; x = 0.00, 0.25, 0.50, and 0.75), prepared using a facile sol-gel method. It correlates structural changes with magnetic and dielectric properties. The as-synthesized samples were investigated by X-ray diffraction (XRD) analysis, BET surface area analyzer, energy-dispersive X-ray (EDX), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), Mössbauer spectroscopy, and impedance analyzer. The pristine sample (CFO) comprised of NPs with 25 nm size, which decreased up to 11 nm upon the formation of Zn 0.75 Co 0.25 Fe 2 O 4 . The N 2 adsorption-desorption isotherm of the prepared Zn 0.5 Co 0.5 Fe 2 O 4 sample confirmed the presence of a mesoporous structure. SEM images revealed that all prepared samples exhibited porous surface with honeycomb-like structures. The cationic distribution was described by Mössbauer spectra. The increment of Zn ions in the prepared samples resulted in sharp reduction of saturation magnetization and remanence values. The normal dielectric dispersion behavior was recorded and can be ascribed to the Maxwell-Wagner type polarization. Besides, the dielectric parameters varied by increasing Zn content in CFO NPs. This may be ascribed to O 2 vacancies and Fe 3+ ions in A-and B-sites. Dielectric studies revealed that, content of Zn ions beyond x = 0.25 was sufficient to reduce both dielectric constant and loss at low frequencies.

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“…They observed exothermic peak at about 220 °C and attributed to the reaction of nitrates with citric acid, whereas the exothermic peak at about 400 °C corresponds to the decomposition of citric acid. Wei-chi-Hsu et al [26], Ramakrishna et al [27], Shifengyan et al [28], and Humbe et al [29] also studied the thermo-gravimetric and differential temperature analysis for Ni-Cu-Zn ferrites.…”

Section: Thermo-gravimetric and Differential Temperature Analysismentioning

confidence: 99%

Effect of La3+ substitution on structural and magnetic parameters of Ni–Cu–Zn nano-ferrites

et al. 2019

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The ferrite material with compositions Ni 0.7 Cu 0.1 Zn 0.2 La x Fe 2−x O 4 (where x = 0, 0.015, 0.025, and 0.035) was synthesized by oxalate co-precipitation method. The ferrite samples were characterized by thermo-gravimetric and differential temperature analysis (TG-DTA), energy-dispersive X-ray analysis (EDAX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FE-SEM), and vibrating sample magnetometer (VSM) techniques. The EDAX analysis confirmed the formation of required stoichiometric ferrite samples. The formation of cubic spinel structure with the presence of weak ortho-ferrite phases was confirmed from X-ray diffraction analysis. The lattice constant of all the ferrites was found to be increase with increase in La 3+ content. The presence of main two recognized strong absorption bands in the frequency range 400-600 cm −1 in the FTIR spectra shows the formation of well spinel ferrite. Morphological study shows that grain size of the ferrites lies in the range 16.23-24.21 nm. It is observed that the saturation magnetization and magnetic moment of Ni-Cu-Zn ferrites decrease with La 3+ content.

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Investigation of cation distribution and magnetocrystalline anisotropy of Ni x Cu 0.1 Zn 0.9−x Fe 2 O 4 nanoferrites: Role of constant mole percent of Cu 2+ dopant in place of Zn 2+

Cited by 48 publications

References 45 publications

Exploration through Structural, Electrical, and Magnetic Properties of Al³⁺ Doped Ni–Zn–Co Nanospinel Ferrites

Exploration through Structural, Electrical, and Magnetic Properties of Al³⁺ Doped Ni–Zn–Co Nanospinel Ferrites

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

Effect of La3+ substitution on structural and magnetic parameters of Ni–Cu–Zn nano-ferrites

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Investigation of cation distribution and magnetocrystalline anisotropy of Ni x Cu 0.1 Zn 0.9−x Fe 2 O 4 nanoferrites: Role of constant mole percent of Cu 2+ dopant in place of Zn 2+

Cited by 48 publications

References 45 publications

Exploration through Structural, Electrical, and Magnetic Properties of Al3+ Doped Ni–Zn–Co Nanospinel Ferrites

Exploration through Structural, Electrical, and Magnetic Properties of Al3+ Doped Ni–Zn–Co Nanospinel Ferrites

Unveiling the Effect of Zn2+ Substitution in Enrichment of Structural, Magnetic, and Dielectric Properties of Cobalt Ferrite

Effect of La3+ substitution on structural and magnetic parameters of Ni–Cu–Zn nano-ferrites

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Exploration through Structural, Electrical, and Magnetic Properties of Al³⁺ Doped Ni–Zn–Co Nanospinel Ferrites

Exploration through Structural, Electrical, and Magnetic Properties of Al³⁺ Doped Ni–Zn–Co Nanospinel Ferrites