Alternating current field, block

Displacement of mobile charges is often spatially limited due to heterogeneous stmcture of the polymer matericds or blocking electrodes therefore, the dc conductance may be not observable, but alternative current (ac) conductivity (cfac) can be found at sufficiently high frequencies. If the limitation of carrier mobility occurs at the phase boundary, the interfacial polarization occurs. The polarization may also be induced by the reorientation of the dipoles present in the stmcture of maciomolecules in the direction of electrical field. The polarization effects are related to dielectric properties characterized by complex dielectric permittivity which is frequency... 

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