A precise numerical prediction of effective dielectric constant for polymer-ceramic composite based on effective-medium theory

Nanostructure polymer-ceramic composite with high dielectric constant (epsi lon (r) similar to 90) has been developed for embedded capacitor applicatio n. This polymer-ceramic system consists of lead magnesium niobate-lead tita nate (PMN-PT) ceramic particle and modified high-dielectric constant low-vi scosity epoxy resin. In order to obtain precise prediction of effective die lectric constant of this composite, a empirical prediction model based on s elf-consistent theory is proposed. The electrical polarization mechanism an d interaction between epoxy resin and ceramic filler has been studied, This model can establish the relevant constitutional parameters of polymer-cera mic composite materials such as particle shape, composition, and connectivi ty that determine the dielectric properties of the composite. This model is simpler, uses fewer parameters and its prediction compares better with exp eriment (error <10 %), The precision and simplicity of the model can be exp loited for predictions of the properties and design of nanostructure ferroe lectric polymer-ceramic composites. The Effective-medium Theory (EMT) has b een proved a good tool to predict effective properties of nanocomposites.