Dielectric Mixing Laws in Ceramic/Polymer Composites

摘要

Dielectric mixing laws were examined for the composites consisting of ferroelectric ceramics particles dispersed in the polymer matrix. The rate of increase in the dielectric permittivity with increasing ceramics content was shown to be consistent with classical Bruggeman predictions. The use of semiconductive polymer matrix generates dielectric as well as conductive relaxations associated with interfacial polarization. Analysis of the observed electrical spectra led to estimates of the dielectric permittivity of the ferroelectric ceramics particles. Discussion will be given with respect to the size effect on the dielectric response of the ferroelectric fine particles.