Electric Conductivity and Dielectric Dispersion of Polyvinylchloride–Graphite Composites
| Autor: | M. M. Kuliev, R. S. Ismaiilova, Kh. S. Aliev, A. O. Orudzhev |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Fermi level Percolation threshold 02 engineering and technology Surfaces and Interfaces Dielectric Conductivity 021001 nanoscience & nanotechnology Hot pressing 01 natural sciences Industrial and Manufacturing Engineering Surfaces Coatings and Films symbols.namesake Percolation theory Electrical resistivity and conductivity 0103 physical sciences symbols Graphite Composite material 0210 nano-technology |
| Zdroj: | Surface Engineering and Applied Electrochemistry. 54:117-124 |
| ISSN: | 1934-8002 1068-3755 |
| Popis: | The dielectric properties of polyvinylchloride–graphite composites in a wide range of temperatures (20–150°C) and frequencies (25–106 Hz) have been described and analyzed. Polyvinylchloride–graphite composites have been synthesized in accordance with powder technology by hot pressing in a hydraulic press and subsequent rapid cooling in a water–ice mixture (quenching mode). The dielectric permeability and electric conductivity of the polyvinylchloride–graphite composite system obey the power law of the percolation theory. The percolation threshold of these composites is ~6.35 vol % of graphite. At a certain concentration of graphite, polyvinylchloride–graphite composites exhibit high dielectric permeability, significant losses, and high dc and ac electric conductivity. With anincrease in the applied-field frequency, the permeability decreases, while theelectric conductivity, conversely, increases. It has been shown that the main mechanism of electric conductivity in polyvinylchloride–graphite insulators is barrier hopping; according to this mechanism, electrons hop over states localized in the vicinity of the Fermi level. In addition, the temperature and frequency dispersions of e' and tanδ have been discussed; the specific features of the dispersion curves have been revealed. |
| Databáze: | OpenAIRE |
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