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    Crystal structure and peculiarities of microwave parameters of Co1-xNixFe2O4 nano spinel ferrites
    (Royal Soc Chemistry, 2023) Hussein, Marwa M.; Saafan, Samia A.; Abosheiasha, H. F.; Zhou, Di; Klygach, D. S.; Vakhitov, M. G.; Trukhanov, S. V.
    Nanosized spinel ferrites Co1-xNixFe2O4 (where x = 0.0-1.0) or CNFO have been produced using a chemical method. The crystal structure's characteristics have been determined through the utilization of X-ray diffraction (XRD). It has been demonstrated that all samples have a single phase with cubic syngony (space group Fd3m). The lattice parameter and unit cell volume behavior correlate well with the average ionic radii of Co2+ and Ni2+ ions and their coordination numbers. Thus, an increase in the Ni2+ content from x = 0.0 to x = 1.0 leads to a decrease in the lattice parameter (from 8.3805 to 8.3316 angstrom) and unit cell volume (from 58.86 to 57.83 angstrom(3)). Elastic properties have been investigated using Fourier transform infrared (FTIR) analysis. The peculiarities of the microwave properties have been analyzed by the measured S-parameters in the range of 8-18 GHz. It was assumed that the energy losses due to reflection are a combination of electrical and magnetic losses due to polarization processes (dipole polarization) and magnetization reversal processes in the region of inter-resonant processes. A significant attenuation of the reflected wave energy (-10 ... -21.8 dB) opens broad prospects for practical applications.
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    Delving into the properties of nanostructured Mg ferrite and PEG composites: A comparative study on structure, electrical conductivity, and dielectric relaxation
    (Cell Press, 2023) El-Ghazzawy, Enas H.; Zakaly, Hesham M. H.; Alrowaily, Albandari W.; Saafan, Samia A.; Ene, Antoaneta; Abo-aita, Nagat M.; Darwish, Moustafa A.
    Magnesium ferrite (MgFe2O4) and polyethylene glycol (PEG) are materials known for their versatility in various applications. This study presents a comprehensive comparative analysis of the electrical conductivity and dielectric relaxation of nanostructured MgFe2O4 and its composites with PEG. Through experimentation, it was observed that incorporating PEG into MgFe2O4 did not lead to a high relative observed decrease or increase in electrical conductivity at room temperature. The study revealed that the composites maintained stable electrical behavior at room temperature, with a dielectric constant value of around 9 and a loss tangent value of around 0.1 at high frequency (around 7 MHz). The electron-hole hopping mechanism was identified as the underlying cause for the strong dielectric dispersion with frequency. The low dielectric loss and conductivity of the MgFe2O4 and PEG/ferrite composites make them promising candidates for high-frequency switching applications and microelectronic devices, particularly in scenarios where negligible eddy currents are essential. Additionally, complex impedance data analysis demonstrated that the capacitive and resistive properties of the composites are primarily attributed to grain boundary processes. This study provides a comprehensive analysis of the electrical and dielectric properties of MgFe2O4 and PEG composites and highlights their potential for many applications in materials science, particularly in electrical and electronic devices.
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    Impact of the Ni/Co ratio on structural and magnetic properties in A-site stoichiometric nanosized spinel ferrites
    (Elsevier Sci Ltd, 2023) Hussein, Marwa M.; Saafan, Samia A.; Abosheiasha, H. F.; Zhou, Di; Silibin, M. V.; Trukhanov, S. V.; Trukhanov, A. V.
    We present a meticulous synthesis of Co1-xNixFe2O4 nanoparticles (0.0 <= x <= 1.0) via the chemical citrate precursor technique. Comprehensive X-ray diffraction (XRD) analyses showcased prominent diffraction peaks, especially for the x = 0.0 sample, corroborating the impeccable cubic spinel ferrite structure devoid of extraneous phases. This structural integrity is further evidenced by a linear attenuation in unit cell parameters with heightened Ni2+ ion concentration, a phenomenon seamlessly aligning with Vegard's law and the nuances of the A-site ionic radii. Magnetic characterizations derived from Vibrating Sample Magnetometer (VSM) evaluations reveal a pronounced modulation in primary magnetic parameters with increasing Ni content. This modulation not only resonates with the charge and spin dynamics of the A-site ions but also accentuates the cardinal role of cation distribution between A- and B-sites in magnetic property determination.