Relationships between suspension formulations and the properties of BaTiO3/epoxy composite films for integral capacitors

Although integral capacitors fabricated using polymer/ceramic composite film have been intensively investigated, there was no systematic study of relationships between suspension formulation and properties of capacitors made from the suspension. In this paper the effects of the suspension formulation such as powder size, amount of dispersant, and amount of solvent, on the capacitor properties such as dielectric constant, dielectric loss, leakage current were investigated using BaTiO3 as a ceramic filler and epoxy resin as a polymer. It was found that high packing density could not only provide high dielectric constant and high capacitance but also high leakage current.