METHOD of SYNTHESIS and PROPERTIES of POLYMER NANOCOMPOSITE PVA-CoFe1.97Ce0.03O4
Keywords:ferrite, polyvinyl alcohol, composite, IR spectroscopy, saturation magnetization
In recent years, developments in the field of technologies for obtaining microwave absorption materials have received significant development. Currently, when a huge number of devices that are potential sources of electromagnetic waves are used, a problem has arisen related to the emergence of electromagnetic radiation that disrupts the operation of electronic devices, affects the environment and people.
In this work, a PVA-CoFe1.97Ce0.03O4 composite was synthesized. The morphology and structure of the starting materials and the composite were characterized using scanning electron microscopy, X-ray diffractometry, and infrared spectroscopy. Magnetic parameters were measured using a vibration magnetometer. The absorption capacity of the obtained materials was evaluated based on the results of measuring the transmission and reflection coefficients using a P2-61 panoramic meter in the range of 8-12 GHz.
The particle size is approximately 8-12 nm. In the X-ray pattern of CoFe1.97Ce0.03O4, it was found that there are extended but easily identifiable peaks. A significant broadening of all diffraction peaks and their low intensity is observed. For the most intense peak at (2q=40.70), the broadening of the peak to 3.1° full width at half-height is observed, which corresponds to the presence of nanosized CoFe1.97Ce0.03O4 crystallites. In addition, the presence of cerium cations with a much larger radius is also evident. The X-ray pattern of PVA-CoFe1.97Ce0.03O4 has small ferrite peaks. IR spectra showed the chemical interaction of polyvinyl alcohol and hydroferrite.
The results show that the absorption characteristics of the PVA-CoFe1.97Ce0.03O4 composition are 7.97-10.78 dB/mm. Effective absorption is observed in the frequency range of 8-10 GHz and indicates the absorption of electromagnetic radiation in this frequency range.
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