Crystal structure and peculiarities of microwave parameters of Co 1- x Ni x Fe 2 O 4 nano spinel ferrites.

Nanosized spinel ferrites Co 1- x Ni x Fe 2 O 4 (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 Fd 3̄ m ). The lattice parameter and unit cell volume behavior correlate well with the average ionic radii of Co 2+ and Ni 2+ ions and their coordination numbers. Thus, an increase in the Ni 2+ 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 Å 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.