Analogy between dielectric relaxation and dielectric mixtures: application of the spectral density representation

The spectral representation is an efficient tool to explore electrical properties of material mixtures. It separates the contributions of geometrical topology and intrinsic properties of the constituents in the system. The aim of this letter is to derive an expression for the spectral density representation, which favours dielectric relaxation phenomenon. This unfamiliar form is distinct in that the existing dielectric relaxation models and data analysis tools can be employed for extracting the spectral density function of a given system. (letter to the editor)