Nonlinear Dielectric Relaxation in AC and DC Electric Fields

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Current theories of the nonlinear static and dynamic dielectric susceptibilities of polar fluids subjected to strong AC and DC electric fields are reviewed with specific emphasis on those extending Debye’s theory of linear dielectric relaxation of an assembly of polar molecules. The inclusion of intermolecular interactions in this theory as well as nonlinear dielectric relaxation in the presence of time-dependent fields is discussed. In particular, we emphasize the role played by intermolecular interactions in the determination of the macroscopic dielectric properties of a polar fluid via microscopic calculations, in both the linear and nonlinear responses.