PREPARATION AND DIELECTRIC-PROPERTIES OF SRTIO3/BATIO3 MULTILAYER THIN-FILMS BY SOL-GEL METHOD

SrTiO3/BaTiO3 multilayer thin films were prepared at 650 degrees C on Pt(111)/SiO2/Si(100) substrates by the dip-coating method using metal alkoxides. No formation of (Ba, Sr)TiO3 solid solution between BaTiO3 layers and SrTiO3 layers was detected in X-ray diffraction analysis. The SrTiO3/BaTiO3 multilayer thin films consisted of grain structure with grain size of about 30 nm. A film thickness of about 20 nm was obtained by one cycle of the dip-coating/heating heating process. The SrTiO3/BaTiO3 multilayer thin films with a thickness of 400 nm exhibited dielectric constants of about 400 and loss tangent of 0.03. By reheating the multilayer thin films at temperatures up to 1000 degrees C, (Ba1-xSrx)TiO3 solid solution with the composition gradient between Ba and Sr was formed.