Comparative Measurements and Analysis of the Electrical Properties of Nanocomposites TixZr1−xC+α-Cy (0.0 ≤ x ≤ 1.0)


Żukowski P. Gałaszkiewicz P. Bondariev V. Okal P. Pogrebnjak A. Kupchishin A. Ruban A. Pogorielov M. Kołtunowicz T.N.
November 2022MDPI

Materials
2022#15Issue 22

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.

carbides , conductivity , frequency , nanocomposite , permittivity , tuneling

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Department of Electrical Devices and High Voltage Technology, Lublin University of Technology, 38A, Nadbystrzycka Str, Lublin, 20-618, Poland
Department of Nanoelectronics and Surface Modification, Sumy State University, 2, R-Korsakov Str, Sumy, 40007, Ukraine
Physico-Technological Center, Abai Kazakh National Pedagogical University, 13, Dostyk Ave, Almaty, 050010, Kazakhstan
Medical Institute, Sumy State University, 31, Sanatornaya Str, Sumy, 40018, Ukraine
Laboratory of Optical Biosensors and Functional Nanomaterials, Institute of Atomic Physics and Spectroscopy, University of Latvia, 19, Raina Blvd, Riga, LV 1586, Latvia

Department of Electrical Devices and High Voltage Technology
Department of Nanoelectronics and Surface Modification
Physico-Technological Center
Medical Institute
Laboratory of Optical Biosensors and Functional Nanomaterials

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