Percolation Phenomena in Cux(SiOy)100-x Nanocomposite Films Produced by Ion Beam-Sputtering
T.N. Koltunowicz a, P. Zukowski a, K. Czarnacka a, I. Svito b and A.K. Fedotov b
aDepartment of Electrical Devices and High Voltage Technology, Lublin University of Technology, Nadbystrzycka 38a, 20-618 Lublin, Poland
bBelarusian State University, 4 Nezavisimosti Av., 220030, Minsk, Belarus
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In this paper the results of examinations of nanocomposites Cux(SiOy)100-x produced by ion beam sputtering using argon ions were presented. The examinations were performed by the use of ac devices for measuring frequency in the range 50 Hz-1 MHz and temperatures from 81 K to 273 K. The measurements were performed for the samples directly after production. Based on temperature dependences of conductivity σ, which were determined at the frequency 100 Hz, the Arrhenius graphs were prepared. From these graphs conductivity activation energies Δ E were calculated. Dependences of conductivity and activation energy of electrons on the metallic phase content x at the frequency 100 Hz were determined. Analysis of the obtained dependences shows that conductivity is a parabolic function of the metallic phase content x in nanocomposites. Changes of activation energies of nanocomposites, in which metallic phase contents are in the ranges x > 12 at.% and x>68 at.%, demonstrate negative values - metallic type of conductivity. In the range 12 at.% < x > 68 at.% activation energies have positive values - the dielectric type of conductivity. It was established that for the metallic phase content of about 68 at.% the real percolation threshold occurs, and the conduction changes from dielectric to metallic type.

DOI: 10.12693/APhysPolA.128.908
PACS numbers: 84.37.+q, 72.80.Ga, 73.22.-f, 61.46.Df, 64.60.ah