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The dielectric properties of materials have come to play a fundamental role in the description of physical phenomena in many branches of modern science, technology, and engineering. Over the last several decades, the equivalent frequency range of Dielectric Spectroscopy (DS) has been expanded by various experimental techniques so dielectric relaxation processes of systems can be measured over an extremely wide range of characteristic times (105 s - 10-12 s).

As a result, these techniques now occupy a special place among numerous modern methods used in physical and chemical analyses of materials. Since dielectric spectroscopy measures the time evolution of molecular polarization, the technique is especially sensitive to intermolecular interactions and their role in molecular cooperative processes. Dielectric spectroscopy provides a link between the dynamics of molecular motion of the individual constituents of the complex material and the characterization of its bulk properties. The recent successful developments of the Time Domain Dielectric spectroscopy methods and Broadband Dielectric Spectroscopy have radically changed the role of dielectric spectroscopy as an effective tool for structural investigation in solids and liquids on macroscopic, microscopic and mesoscopic levels.