Simultaneously obtained high permittivity and low loss in 2-2 fluoro-polymer/anti-ferroelectric ceramic composites from interface effect

Abstract

Interface induced polarization has been proved to have a great impact on dielectric features of 2-2 series composites containing Si-based semi-conducting sheet and polymer layer. In those 2-2 composites, the obviously increased high permittivity of Si-based ceramic sheet was confirmed to be responsible for the measured high permittivity of composites. Interface interaction was found to come from strong electrostatic pull of high polarity polymer layer and induced high polarity of Si-based ceramic sheet. In this work, the similar interface interaction was utilized to obtain the desired promising 2-2 series composite dielectrics made from ultra-high polarity anti-ferroelectric ceramic sheet and high polarity fluoropolymer layer. Based on compositing, the obviously elevated high permittivity detected in polymer layer was found to strongly contribute to tested high permittivity in resulting composites. In this case, interface induced polarization should come from a very large electrostatic pull of ceramic sheet (ultra-high polarity ionic dipoles) and elevated high induced polarity of polymer layer (high polarity covalent dipoles). Dielectric and conductive properties of two designed 2-2 composites have been detailedly researched. Reduced total inborn polarity of ceramic sheet was found to lead to a maintained high permittivity, lowered dielectric loss and decreased conductivity in resulting composite. This work might provide a facile route to obtain the desired composite dielectrics with promising comprehensive electric properties based on interface effect in 2-2 composites.