Funct. Mater. 2023; 30 (1): 49-54.


Electrophysical properties of polychlotriftorethylene-carbonile iron system at low and high frequencies

S.M.Makhno1,2,3, O.M.Lisova3, P.P.Gorbyk3, G.M.Gunya3, M.T.Kartel1,2,3

1Ningbo University of Technology, 201 Fenghua Road, 315211 Ningbo, China
2Ningbo Sino-Ukrainian New Materials Industrial Technologies Institute, Kechuang building, N777 Zhongguan road, 315211 Ningbo, China
3O.Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine, 17 General Naumov Str., 03164 Kyiv, Ukraine


The samples of polychlotrifluoroethylene (PCTFE) - carbonyl iron (CI) with a 0-0.2 volume fraction of the filler was obtained by the method of thermal pressing of the polymer melt. The electrophysical and magnetic properties of the PCTFE-CI system samples in the ultra-high frequency range and at low frequencies were investigated by impedance spectrometry, two-contact method, and by using a high-frequency interferometer. It is shown that the real ε′ and the imaginary ε′′ components of the complex dielectric constant ε* are reduced by 10 % in the range of 8-12 GHz due to the frequency dispersion of the filler properties. When the content of CI in the polymer is above the percolation threshold, the dependence of electrical conductivity on frequency is absent in the range of 10-2 - 105 Hz. Using the contactless induction method, the maximum surface charge of PCTFE-CI film composites was observed at a content of CI somewhat below the percolation threshold in the system. It is shown that the composites have stable characteristics up to a temperature of 90°C. The magnetic properties of the ferromagnetic materials have a maximum in the microwave range due to the high-frequency losses associated with the precession of magnetization in its own internal field (anisotropy field) of the magnetic material. Natural ferromagnetic resonance (NFR) occurs when the frequency of the external electromagnetic field coincides with the frequency of precession of the magnetic moment in the intra-domain field. The change in the values of μ′ and μ′′ in the range of 4 - 10.5 GHz is probably related to the resonant nature of the interaction of the short circuit with electromagnetic radiation, and the mechanism of absorption of microwave radiation with the natural ferromagnetic resonance of the short circuit at such frequencies.

microwave band, ferromagnetic resonance, percolation threshold, carbonyl iron.
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