Abstract:
The work is dedicated to the study of the structural and optical characteristics, as well as the
phase transformations, of ferrite nanoparticles of CeO2-Fe2O3. To characterize the results obtained,
the methods of scanning and transmission microscopy, X-ray diffraction (XRD) spectroscopy, and
Mössbauer spectroscopy were applied. It was found that the initial nanoparticles are polycrystalline
structures based on cerium oxide with the presence of X-ray amorphous inclusions in the structure,
which are characteristic of iron oxide. The study determined the dynamics of phase and structural
transformations, as well as the appearance of a magnetic texture depending on the annealing
temperature. According to the Mossbauer spectroscopy data, it has been established that a rise in
the annealing temperature gives rise to an ordering of the magnetic properties and a decrease in the
concentration of cationic and vacancy defects in the structure. During the life test of synthesized
nanoparticles as cathode materials for lithium-ion batteries, the dependences of the cathode lifetime
on the phase composition of nanoparticles were established. It is established that the appearance of
a magnetic component in the structure result in a growth in the resource lifetime and the number
of operating cycles. The results show the prospects of using these nanoparticles as the basis for
lithium-ion batteries, and the simplicity of synthesis and the ability to control phase transformations
opens up the possibility of scalable production of these nanoparticles for cathode materials.
