Discontinuity and Anisotropy of Conducting Phase in Heterogeneous Systems as Seen by Alternating Current Measurements

Abstract

A.c. conductivity measurements are used for investigations of defects and anisotropy of conducting networks in model organic composites, reticulate doped polymers containing both low molecular weight and polymeric CT complexes. The frequency dependence of conductivity occurs if the conducting phase, although continuous, is defective. The temperature dependence of the onset frequency follows predictions of the random barrier network model. For the systems with anisotropic networks angular dependences of microwave conductivity are smooth, and the anisotropy ratio is temperature independent, indicating that the network is oriented but continuous in all directions.