Abstract
Our samples are mixtures consisting of particles of graphite dispersed within a matrix of a doped substituted polyacetylene. The electrical impedance spectra are discussed in terms of inhomogeneity and intrinsic contributions. The frequency dependence of the a.c. conductivity and permittivity has been measured at frequencies between 10 kHz and 12 GHz. The a.c. conductivity is given by the power-law relation σ( ω) ∝ ω n with 0 < n < 0.4 at frequencies below 30 MHz, 0.5 < n < 1 at frequencies between 30 MHz and 2 GHz and 1 < n < 2 at frequencies between 2 GHz and 8 GHz. A saturation occurs at approximately 8 GHz. Various theoretical approaches are presented in order to support such behaviour.
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