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Tunneling conductivity in a system of spheres with different characteristic tunneling distance to spheres diameters ratio as a function of the volume fraction . The matrix intrinsic conductivity for and the overall conductivity for the case are shown. Results from Eq. (2) with are displayed by dotted lines
Geometrical percolation threshold of the hard-core-soft-shell model from algorithm of present work and from results of Ref. 16. Shown is the critical interaction distance to sphere diameter ratio as a function of the hard spheres volume fraction .
Characteristic tunneling distance as extrapolated from experimental results on low structure CB and graphite-polymer composites.
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