Effect of cation distribution on the structural and dielectric properties of $${\mathrm{N}\mathrm{i}}_{0.5-x}{\mathrm{C}\mathrm{o}}_{x}{\mathrm{Z}\mathrm{n}}_{0.5}{\mathrm{F}\mathrm{e}}_{2}{\mathrm{O}}_{4}$$ (0.0 ≤ x ≤ 0.5) ferrites

Rafique, T.; Rehman, Atta Ur; Wahab, Hassan; Khalid, Waqas; Ali, Zulqurnain; Nadeem, M.

doi:10.1007/s10854-020-03645-8

Cited by 9 publications

(5 citation statements)

References 38 publications

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“…figure that the experimental values have been found to decrease by increasing the zinc concentration. The cations distribution and electron exchange between Fe 2+ -Fe 3+ ions within the spinel lattice (octahedral site) plays an important role in the electrical values of ferrites, and there are plenty of articles discussing this aspect, trying to explain the observable stoichiometry dependence[34,35]. Shown in Fig.7is the change in dielectric loss (tan δ) as a function of temperature at various frequencies.…”

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confidence: 99%

WITHDRAWN: Zinc Substituted Nickel-cobalt Nano-ferrites via Citrate-gel Auto-combustion Method for High-frequency Applications: Studies on Crystal Structure and Dielectric Properties

Oumezzine

Iuga

Enculescu

et al. 2021

Preprint

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Ni0.8−xZnxCo0.2Fe2O4 (x = 0.0, 0.05, 0.10 and 0.20) were prepared by citrate-gel auto-combustion method. The structural investigation using powder X-ray diffraction (XRD) showed the formation of single-phase cubic spinel structures with Fd-3m space group for all prepared samples. As the Zn2+ concentration is increased, the values of the lattice constant, tetrahedral and octahedral bond lengths undergo significant change. The absolute experimental lattice parameters are closely to the Vegard’ s law derived ones, suggesting that the cations concentration fairly correspond with those calculated prior chemical synthesis. Fourier transform infrared (FTIR) absorption bands at 594–400 cm− 1 confirm the formation of spinel structure. The values of dielectric constant and loss tangent were reported to decline with frequency and the Zn2+composition (x). Incorporation of Zn at nickel-cobalt resulted in decrease in ac conductivity at RT. Here, we report a low loss tangent factor of the order of 8 × 103for the sample with x = 0.20 make this composition suitable for high frequency applications. Imaginary electric modulus studies unveil the presence of non-Debye type of dielectric relaxation phenomenon. The activation energy of our samples calculated from modulus spectra is found to increase with further substitution of Zn2+ concentration.

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confidence: 99%

WITHDRAWN: Zinc Substituted Nickel-cobalt Nano-ferrites via Citrate-gel Auto-combustion Method for High-frequency Applications: Studies on Crystal Structure and Dielectric Properties

Oumezzine

Iuga

Enculescu

et al. 2021

Preprint

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“…The Zn 2+ incorporation promotes Fe 3+ -O-Fe 3+ network formation within the spinel lattice (octahedral site), which may lead to the decrease in the mobility of hopping channels. 5 Here, the dipole orientation is likely through the Fe 3+ -O-M 2+ network (M is Co or Ni). Shown in Fig.…”

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confidence: 99%

“…The substitution with a controlled concentration of different divalent ions (Ni 2+ , Co 2+ and Zn 2+ ) in the spinel structure modifies their electromagnetic properties. 5,6 Hosting Co in Ni-Zn ferrites can improve the resistive properties with a reduction in dielectric loss. 5 It was also informed that partial substitution of Fe 3+ in B-sites spinel structure, by rare Earth (RE 3+ ) ions with large ionic radius may drive the structural properties to change by generating internal stress.…”

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confidence: 99%

“…5,6 Hosting Co in Ni-Zn ferrites can improve the resistive properties with a reduction in dielectric loss. 5 It was also informed that partial substitution of Fe 3+ in B-sites spinel structure, by rare Earth (RE 3+ ) ions with large ionic radius may drive the structural properties to change by generating internal stress. This would be expected to significantly modify the magnetic and electrical properties.…”

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Structural, Frequency and Temperature Dependent Dielectric Properties of Zn²⁺ Substituted Ni-Co Based Spinel Ferrite (Zn_xNi_0.8−xCo_0.2Fe₂O₄)

Oumezzine¹,

Iuga²,

Enculescu³

et al. 2023

ECS J. Solid State Sci. Technol.

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Zinc substituted nickel-cobalt ferrites, i.e., ZnxNi0.8−xCo0.2Fe2O4 (x=0.0, 0.05, 0.10 and 0.20) with average crystallite size 100 nm were synthesized by citrate-gel auto-combustion method to investigate effects of Zn2+ substitution on the structural and dielectric properties. Both X-ray diffraction (XRD) and IR spectroscopy studies confirms the formation of pure cubic spinel structure. Variation of lattice parameter infers Vegard’s law linear dependence with the addition of Zn2+ concentration. The temperature-dependent behavior of dielectric and modulus spectra has been studied within the frequency range 100 Hz-100 kHz for different temperatures between 100K and 400 K. It was concluded that the dielectric responses of ZnxNi0.8−xCo0.2Fe2O4 are found to be frequency dependent and thermally activated. Also, In the Zn doped ferrites variations of dielectric loss (tan δ) and the imaginary part of electric modulus (Mʺ) show the presence of the non-Debye type of dielectric relaxation. Rise in Zinc concentration leads to a decrease in dielectric constant (εr) due to the declining of Fe3+–O–M2+ conducting network (M is Co or Ni). Here, we report a low loss tangent factor of the order of for the sample Ni0.6Zn0.2Co0.2Fe2O4 make this composition suitable for high frequency-applications at room temperature.

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“…This can be further extended to affect the dielectric properties by varying the bond lengths, and consequently the hopping of electrons between the cations. 14 The magnitudes of the modification of the dielectric properties depend on the substituting ion, its ionic radius, its preference site and electronic configuration. By choosing the proper divalent metal cation M 2+ for the cobalt ferrite, the dielectric properties can be effectively tuned.…”

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confidence: 99%

Observation of dielectric dispersion and relaxation behavior in Ni²⁺-substituted cobalt ferrite nanoparticles

et al. 2022

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Effect of cation distribution on the structural and dielectric properties of $${\mathrm{N}\mathrm{i}}_{0.5-x}{\mathrm{C}\mathrm{o}}_{x}{\mathrm{Z}\mathrm{n}}_{0.5}{\mathrm{F}\mathrm{e}}_{2}{\mathrm{O}}_{4}$$ (0.0 ≤ x ≤ 0.5) ferrites

Cited by 9 publications

References 38 publications

WITHDRAWN: Zinc Substituted Nickel-cobalt Nano-ferrites via Citrate-gel Auto-combustion Method for High-frequency Applications: Studies on Crystal Structure and Dielectric Properties

WITHDRAWN: Zinc Substituted Nickel-cobalt Nano-ferrites via Citrate-gel Auto-combustion Method for High-frequency Applications: Studies on Crystal Structure and Dielectric Properties

Structural, Frequency and Temperature Dependent Dielectric Properties of Zn²⁺ Substituted Ni-Co Based Spinel Ferrite (Zn_xNi_0.8−xCo_0.2Fe₂O₄)

Observation of dielectric dispersion and relaxation behavior in Ni²⁺-substituted cobalt ferrite nanoparticles

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Effect of cation distribution on the structural and dielectric properties of $${\mathrm{N}\mathrm{i}}_{0.5-x}{\mathrm{C}\mathrm{o}}_{x}{\mathrm{Z}\mathrm{n}}_{0.5}{\mathrm{F}\mathrm{e}}_{2}{\mathrm{O}}_{4}$$ (0.0 ≤ x ≤ 0.5) ferrites

Cited by 9 publications

References 38 publications

WITHDRAWN: Zinc Substituted Nickel-cobalt Nano-ferrites via Citrate-gel Auto-combustion Method for High-frequency Applications: Studies on Crystal Structure and Dielectric Properties

WITHDRAWN: Zinc Substituted Nickel-cobalt Nano-ferrites via Citrate-gel Auto-combustion Method for High-frequency Applications: Studies on Crystal Structure and Dielectric Properties

Structural, Frequency and Temperature Dependent Dielectric Properties of Zn2+ Substituted Ni-Co Based Spinel Ferrite (ZnxNi0.8−xCo0.2Fe2O4)

Observation of dielectric dispersion and relaxation behavior in Ni2+-substituted cobalt ferrite nanoparticles

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Structural, Frequency and Temperature Dependent Dielectric Properties of Zn²⁺ Substituted Ni-Co Based Spinel Ferrite (Zn_xNi_0.8−xCo_0.2Fe₂O₄)

Observation of dielectric dispersion and relaxation behavior in Ni²⁺-substituted cobalt ferrite nanoparticles