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- Title
Comparative Measurements and Analysis of the Electrical Properties of Nanocomposites Ti x Zr 1− x C+α-Cy (0.0 ≤ x ≤ 1.0).
- Authors
Żukowski, Paweł; Gałaszkiewicz, Piotr; Bondariev, Vitali; Okal, Paweł; Pogrebnjak, Alexander; Kupchishin, Anatolyi; Ruban, Anatolyi; Pogorielov, Maksym; Kołtunowicz, Tomasz N.
- Abstract
In this paper, the frequency-temperature dependence of the conductivity and dielectric permittivity of nc-TixZr1−xC+α-Cy (0.0 ≤ x ≤ 1.0) nanocomposites produced by dual-source magnetron sputtering was determined. The films produced are biphasic layers with an excess of amorphous carbon relative to the stoichiometric composition of TixZr1−xC. The matrix was amorphous carbon, and the dispersed phase was carbide nanoparticles. AC measurements were performed in the frequency range of 50 Hz–5 MHz at temperatures from 20 K to 373 K. It was found that both conductivity and permittivity relationships are determined by three tunneling mechanisms, differing in relaxation times. The maxima in the low- and high-frequency regions decrease with increasing temperature. The maximum in the mid-frequency region increases with increasing temperature. The low-frequency maximum is due to electron tunneling between the carbon films on the surface of the carbide nanoshells. The mid-frequency maximum is due to electron transitions between the nano size grains. The high-frequency maximum is associated with tunneling between the nano-grains and the carbon shells. It has been established that dipole relaxation occurs in the nanocomposites according to the Cole-Cole mechanism. The increase in static dielectric permittivity with increasing measurement temperature is indicative of a step polarisation mechanism. In the frequency region above 1 MHz, anomalous dispersion—an increase in permittivity with increasing frequency—was observed for all nanocomposite contents.
- Subjects
NANOCOMPOSITE materials; PERMITTIVITY measurement; CARBON films; AMORPHOUS carbon; ELECTRON transitions
- Publication
Materials (1996-1944), 2022, Vol 15, Issue 22, p7908
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma15227908