HETEROEPITAXIAL GROWTH OF BATIO3 THIN-FILMS ON SRTIO3 SUBSTRATES UNDER HYDROTHERMAL CONDITIONS

Heteroepitaxial growth of BaTiO3 films on SrTiO3 single-crystal substrates was studied in Ba(OH)2 solution under hydrothermal conditions above 450-degrees-C. The epitaxial relation, BaTiO3 (hkl) parallel-to SrTiO3 (hkl), was confirmed for the films on (100), (110), (111) and (210) faces of the SrTiO3 crystals. Morphology of the grown surfaces faceted by {100} faces was directly affected by the indices of the substrate surface as a result of the epitaxial relation. In particular, monolithic films having a smooth surface were formed on SrTiO3 (100) substrates.