Effective dielectric constant prediction of polymer-ceramic composite based on self-consistent theory

Nanostructure polymer-ceramic composite with high dielectric constant (ε_r~100) has been developed for embedded capacitor application. This polymer-ceramic system consists of lead magnesium niobate-lead titanate (PMN-PT) ceramic particle and modified high dielectric low viscosity epoxy resin. In order to obtain precise prediction of effective dielectric constant of this composite, a closed form prediction model based on self-consistent theory is proposed. The electrical polarization mechanism and interaction between epoxy resin and ceramic filler has been studied. This model can establish the relevant constitutional parameters of polymer-ceramic composite materials such as particle shape, composition, and connectivity that determine the dielectric properties of the composite. This model is simpler, uses fewer parameters and its prediction compares better with experiment (error<10%). The precision and simplicity of the model can be exploited for predictions of the properties and design of nano-structure ferroelectric polymer-ceramic composites. Self-consistent theory has been proved a good tool to predict effective properties of nano-composites