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 Fd3 m). 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 Å)
and unit cell volume (from 58.86 to 57.83 Å3
). 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.
