Dielectric Relaxation in Dielectric Mixtures

摘要: In this thesis dielectric properties of both ideal composite structures and polymeric materials were investigated. Numerical calculations performed to simulate frequency response interfacial polarization using the finite element method in two dimensions. Fictitious binary mixtures considered simulations investigate influences electrical constituents, their concentrations as well distributions phases. addition, effects randomness mixture structure included. The regular disordered compared. A new technique based on Monte Carlo a functional approach an iterational complex nonlinear least squares algorithm developed analyze responses. It was shown that single Debye-like relaxation not relevant for dense mixtures. such systems asymmetric, depending ratios permittivities constituents even fractional power-law dispersions (low dispersion) could be obtained. concluded by just considering polarization, it possible different related phenomena materials. Dielectric spectroscopy measurements have indicated change significantly with filler concentration. Samples high small particles had low spectra, whereas, samples or large having well-defined shapes shape distribution, spectra clear ohmic losses.