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N. I. Abu-Elsaad

Bio: N. I. Abu-Elsaad is an academic researcher from Zagazig University. The author has contributed to research in topics: Lattice constant & Dielectric. The author has an hindex of 1, co-authored 1 publications receiving 22 citations.

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TL;DR: Polycrystalline ferrites, , (where and ), were prepared by using ceramic method and single phase cubic structure was confirmed by X-ray diffractometer and the lattice parameter “a” was found to increase with increasing ion substitution.
Abstract: Polycrystalline ferrites, , (where and ), were prepared by using ceramic method. Single phase cubic structure was confirmed by X-ray diffractometer. The lattice parameter “a” was found to increase with increasing ion substitution. IR spectra of the samples were recorded from 200 to 1000 cm−1. The two primary bands corresponding to tetrahedral and octahedral were observed at about 575 cm−1 and 370 cm−1, respectively. Elastic properties of these mixed ferrites were estimated as a function of composition. Young's modulus , rigidity modulus , bulk modulus , Debye temperature (), and mean sound velocity () were calculated from the transverse () and longitudinal () wave velocities. The variation of elastic moduli with composition was interpreted in terms of binding forces between the atoms of spinel lattice. AC conductivity and dielectric properties of the samples were measured at room temperature over 100 Hz–1 MHz. The electrical conduction mechanism could be explained with the electron hopping model. Frequency exponential factor was calculated and it was found between 0.4 and 0.8.

30 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, the cation distribution of the spinel system Zn1-xCoxFe2O4 has been investigated by means of X-ray diffraction (XRD), Mossbauer spectroscopy and Fourier transform infrared spectrograph (FTIR).

144 citations

Journal ArticleDOI
TL;DR: In this article, the composition dependent elastic and thermal properties of Li Zn ferrite (Li0.5-x/2ZnxFe2.0) ceramics were reported.

66 citations

Journal ArticleDOI
TL;DR: The single phase cubic spinel structure of the ferrites was confirmed by X-ray diffraction analysis using Transmission Electron Microscopy (TEM) micrographs reveal that the particle size of the samples was in the nanometric range confirming the nano crystalline nature.

47 citations

Journal ArticleDOI
TL;DR: In this paper, the impact of replacing trivalent iron (Fe3+) ions with rare earth europium (RE-Eu3+ ions on the microstructure, optical and magnetic properties of the produced CoFe2O4 nanoparticles was studied.

44 citations

Journal ArticleDOI
TL;DR: The magnetic field and particle-concentration dependent steady-state shear-responses of rod shaped Li-Zn ferrite particle based magnetorheological fluids (MRFs) are reported and, based on the on-state to off-state viscosity ratio (ηon/ηoff), the optimum particle concentration required for energy- and cost-efficient operation of the MRFs can be chosen.
Abstract: We report the magnetic field and particle-concentration dependent steady-state shear-responses of rod shaped Li–Zn ferrite particle based magnetorheological fluids (MRFs). Rod-shaped soft ferrimagnetic Li–Zn ferrite (Li0.4Zn0.2Fe2.4O4) particles were synthesized using the combustion synthesis method. MRFs of three different particle-concentrations (ϕ = 0.1, 0.2 and 0.4, in weight fraction) were prepared using silicone oil. Their yield strength and dynamic viscosity were studied at different applied magnetic fields (B). With an increase in B and ϕ, the yield strength (τY) of the MRFs increases. This behaviour is assigned to the formation of stronger columnar structures of the magnetically interacting particles which resist the flow (shear) of the MRF. For the MRF with ϕ = 0.4 and B = 1.2 T, we observed a maximum τY value of ∼1.25 kPa. Furthermore, we observed that, based on the on-state to off-state viscosity ratio (ηon/ηoff) at a particular operating B value, the optimum particle concentration required for energy- and cost-efficient operation of the MRFs can be chosen. The absence of a stabilizing-agent or de-agglomerating-coating, the low density, and the excellent oxidation- and corrosion-resistance of the soft ferrimagnetic rod-shaped Li–Zn ferrite particles make this MRF-system highly versatile and economical for many magneto-mechanical applications.

38 citations