Dielectric properties and discharge energy density of epoxy composites with 3D BaTiO3 network structure

Abstract A three-dimensional network structure of BaTiO3 (3D-BTO) ceramic was constructed using cellulose sponge as a template at 1200 °C. The 3D-BTO/epoxy composites were prepared at various BTO contents of 5, 7, and 10 vol%. The dielectric constant and tanδ of the composites increased as the BTO content increased. With a BTO content of 10 vol%, the dielectric constant and discharged energy density were 42.0 at 1 MHz and 1.57 mJ/cm3 at 25 kV/cm, respectively. However, tanδ and energy loss density were larger. The enhancement of dielectric constant and discharge energy density at low BTO content (10 vol%) was attributable to a continuous 3D network structure of BTO phase in the composites.