RODIN D. O. INFLUENCE OF COMPOSITION ON THE PROPERTIES OF POLYMER NANOCOMPOSITE PVA/GRAPHITE/COFE1.97CЕ0.03O4
DOI:
https://doi.org/10.32782/tnv-tech.2025.1.60Keywords:
PVA, composite, X-ray phase analysis, ferriteAbstract
The development of new materials that absorb microwave radiation is an important area of research that can be used in various industries, such as communications, medical radiation, air defense and various civilian applications. The work investigated composites consisting of polyvinyl alcohol, cerium-modified cobalt ferrite (CoFe1.97Cе0.03O4) synthesized by the coprecipitation method, and graphite. The composites were obtained by mixing the components in different ratios. The characterization of a series of composite materials PVA/graphite/CoFe1.97Cе0.03O4 was performed using X-ray diffraction and X-ray phase analysis, scanning electron microscopy and IR spectroscopy.SEM images show a homogeneous distribution of spherical particles with weak aggregation.The particle size is approximately 8-12 nm.The X-ray diffraction pattern of CoFe1.97Cе0.03O4 shows broadened but easily identifiable peaks. For the most intense peak at (2θ=40.70º), a broadening of the peak to 3.1º full width at half height is observed, which corresponds to the presence of nanosized CoFe1.97Cе0.03O4 crystallites; in addition, the presence of cerium cations, which have a much larger radius, is evident. The diffraction pattern of the PVA- CoFe1.97Cе0.03O4 composite shows small ferrite peaks and pronounced graphite peaks.The effective shielding (dB/mm) and reflection coefficient were measured at different microwave frequencies in the range of 8.0-12.0 GHz. The composite material PVA/graphite/ CoFe1.97Cе0.03O4 with a component ratio of 10:1:10 showed a wider absorption frequency range and a maximum shielding of ⁓25.09 dB at 12 GHz and ⁓23.5 dB at 10 GHz. That is, the composite can be used as a microwave absorber in the range of 8-12 GHz.
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