Dielectric Depression and Dispersion in Electrophoretically Fabricated BaTiO 3 Ceramic Films

Dielectric depression and dispersion were observed in BaTiO 3 ceramic films fabricated by electrophoretic deposition followed by sintering. The dielectric constants were depressed down to 6800‐4600 around the Curie point ( T C ). The dielectric dispersion occurred above T C . These dielectric properties are attributable to a surface layer formed during sintering. XRD analysis indicated that the surface layer was a hexagonal‐like BaTiO 3 phase. A mixed solvent of acetylacetone and alcohol employed in the present work may have been responsible for the formation of the surface layer.