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Synthesis of Ce3+ substituted Ni-Co ferrites for high frequency and memory storage devices by sol-gel routeSheikh, F.A., Noor ul Huda Khan Asghar, H.M., Khalid, M., Gilani, Z.A., Ali, S.M., Khan, N., Shar, Muhammad A., Alhazaa, A. 28 December 2023 (has links)
Yes / Cerium (Ce3+) substituted Ni-Co ferrites with composition Ni0.3Co0.7CexFe2−xO4 (x = 0.0–0.20, with step size
0.05) were synthesized by sol-gel method. Face-centered cubic (FCC) spinel structure was revealed by X-ray
analysis. The crystalline size was calculated ranging between 17.1 and 18.8 nm, lattice constant showed a
decreasing trend with increase of Ce3+ contents, furthermore, X-ray density was calculated between 5.30
and 5.69 g/cm3. The two characteristic spinel ferrites absorption bands were seen around 550 (cm−1) and
415 (cm−1) in Fourier transform infra-red (FTIR) spectroscopy. The microstructural and elemental studies
were carried out by field emission transmission electron microscopy (FE-TEM) and energy dispersive X-ray
(EDX) respectively, the average particle size was calculated around 21.83 nm. Magnetic studies were per-
formed by vibrating sample magnetometer (VSM), which showed that saturation magnetization Ms and
remanence Mr decreased with substitution up to x = 0.10 due to small magnetic moment of Ce3+ than Fe3+.
The coercivity Hc increased with substitution up to 908.93 Oe at x = 0.05, then it decreased following the
trend of anisotropy constant. The dielectric studies exhibited decrease in dielectric parameters with fre-
quency due to decreasing polarization in material. The dielectric loss was significantly decreased in material
at high frequency. The Cole-Cole interpretation exhibited conduction mechanism being caused by grain
boundary density. These attributes of Ce3+ substituted Ni-Co ferrites suggest their possible use in memory
storage, switching and high frequency devices like antenna and satellite systems. / The authors would like to acknowledge the Researcher's Supporting Project Number (RSP-2021/269) King Saud University, Riyadh, Saudi Arabia, for their support in this work. / The full-text of this article will be released for public view at the end of the publisher embargo on 28 Dec 2023.
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