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Electrical conduction mechanism of polymer-carbon black composites below and above the percolation threshold

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3 Author(s)
S. Nakamura ; Dept. of Electron., Mie Univ., Tsu, Japan ; T. Tommura ; G. Sawa

DC electrical conduction below the percolation pc is due to a tunneling mechanism between finite clusters because of a non-ohmic behavior of current and the appearance of a current independent of frequency in ac conduction. The temperature dependence of resistivity ρ depending on applied field can be well explained with a tunneling model by incoporating the effect of thermal expansion on a tunneling gap in the model. In the region above pc, on the other hand, the electrical conduction takes place on conducting pathways between electrodes. The temperature dependence of resistivity ρ above pc, is discussed with a model where the effects of thermal expansion on the number of conducting pathways and a thermally activated process in electrical conduction are taken into account

Published in:

Electrical Insulation and Dielectric Phenomena, 1998. Annual Report. Conference on  (Volume:1 )

Date of Conference:

25-28 Oct 1998