Electrochemical, magnetic and structural features of Ni$_{0.2}$Zn$_{0.8}$Fe$_2$O$_4$, nanoparticles synthesized under the conditions of thermal treatment of X-ray amorphous combustion products

For the first time, nickel-zinc ferrite nanopowder with the composition Ni$_{0.2}$Zn$_{0.8}$Fe$_2$O$_4$ was synthesized and physicochemically characterized by the method of thermal treatment of X-ray amorphous products of solution combustion method. It has been shown that ferrite formation occurs at a temperature of 465$^\circ$C. A study of magnetic characteristics demonstrated that the resulting nickel-zinc ferrite nanopowder has a typical antiferromagnetic nature. The results obtained show the possibility of synthesizing X-ray amorphous combustion products of nanostructures with an average particle size of 24.8 nm, a degree of crystallinity of the order of 100%, and a specific surface area of 34.6 cm$^2$/g using thermal treatment.