MICROSTRUCTURAL DEVELOPMENT OF BATIO3 HETEROEPITAXIAL THIN-FILMS BY HYDROTHERMAL SYNTHESIS

The hydrothermal growth of epitaxial BaTiO3 thin films on single-cryst al SrTiO3 substrates occurs by the island growth mode. The aqueous sol ution chemistry is found to control interfacial characteristics and pl ays an important role in controlling film formation and faceting, Isla nd faceting can be changed by the introduction of additional cations d uring synthesis. Electrophoretic data, confirmed by adsorption measure ments, show that barium is a potential determining counterion and adso rbs on SrTiO3 surfaces. Initial electrical measurements show that the BaTiO3 films have a dielectric constant of 141 with a loss tangent of 0.9 that decreases with heat treatment.