Volume: 2, 2023
2nd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland:
ENVIRONMENT – PLANT – ANIMAL – PRODUCT
Abstract number: T013
DOI: https://doi.org/10.24326/ICDSUPL2.T013
Published online: 19 April 2023
ICDSUPL, 2, T013 (2023)
Electrical properties of nanocomposites TixZr1−xC+α-Cy (0.0 ≤ x ≤ 1.0)
Piotr Gałaszkiewicz1*
1 Department of Electrical Equipment and High Voltage Technology, Electrical Engineering and Computer Science Faculty, Lublin University of Technology, Nadbystrzycka St. 38D, 20-618 Lublin, Poland
* Corresponding author: p.galaszkiewicz@pollub.pl
Abstract
The frequency-temperature dependence of the electrical properties such as conductivity and dielectric permittivity of nanocomposites nc-TixZr1−xC+α-Cy (0.0 ≤ x ≤ 1.0) were determined. Nanocomposites were produced by a dual-source magnetron sputtering method, Layers were sputtered on the planar surface of silicon wafers using two target plates, the first was made of alloys of early transition metals second was made of high-purity carbon. The structure and composition of the films produced were investigated by XRD, SIMS, and energy-dispersive X-ray spectroscopy. The films produced were 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 a carbide nanoparticle. 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.
How to cite
P. Gałaszkiewicz, 2023. Electrical properties of nanocomposites TixZr1−xC+α-Cy (0.0 ≤ x ≤ 1.0). In: 2nd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland: Environment – Plant – Animal – Product. https://doi.org/10.24326/ICDSUPL2.T013