DIELECTRIC DEPRESSION AND DISPERSION IN ELECTROPHORETICALLY FABRICATED BATIO3 CERAMIC FIRMS

Dielectric depression and dispersion were observed in BaTiO3 ceramic f ilm fabricated by electrophoretic deposition followed by sintering. Th e dielectric constants were depressed down to 6800-4600 around the Cur ie point (T-C). The dielectric dispersion occurred above T-C. These di electric properties are attributable to a surface layer formed during sintering. XRD analysis indicated that the surface layer was a hexagon al-like BaTiO3 phase. A mixed solvent of acetylacetone and alcohol emp loyed in the present work may have been responsible for the formation of the surface layer.