Experimental and theoretical investigations of the role of (Co–Ti) in the modification of the functional properties of nanocrystalline Ni–Zn ferrites
Engineering Basic Science Department, Faculty of Engineering, Menoufia University, Shebin El-Kom, Egypt
Accepted: 21 December 2021
Published online: 12 January 2022
The present study experimentally and theoretically investigated the role of Co2+–Ti4+ ions—magnetic and nonmagnetic—in modifying the structure, electrical and magnetic properties of nanocrystalline Ni–Zn ferrites. The studied ferrite samples with the chemical formula Ni0.7Zn0.3(CoTi)xFe2−2xO4 (0 ≤ x ≤ 0.4, step 0.1) were prepared using the conventional ceramic technique. The single-phase cubic spinel structure of the samples was theoretically confirmed using Rietveld refinement. The Rietveld refinement technique revealed that the samples had a single spinel phase with the space group fd3m. Also, the porosity of the prepared samples was calculated as a function of the Co–Ti ions concentration. The cation distribution of the investigated system was assumed and confirmed using infrared measurements and by comparing the theoretical lattice parameter and theoretical magnetization with their experimental values. The effects of the substitution of Fe3+ ions by Co–Ti ions on the hysteresis loop parameters were also studied. As the Co–Ti ions concentration increased, the values of the saturation magnetization, initial permeability, and Curie temperature decreased. The DC resistivity of the prepared samples also increased with increasing Co–Ti concentration up to x = 0.1 and then decreased. Finally, the present study indicated that the sample with x = 0.1 showed high resistivity and relatively high magnetic properties, which can be used in a certain technical applications.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2022