The Study Of Nanometer BaTiO₃ Powder And Preparation Of BaTiO₃ Films With The Method Of Electrophoretic Deposition

The preparation and dielectric properties of nanometer BaTiO₃ powder were systematically studied. The results indicated that the ratio of titanium isopropoxide to glacial acid, reaction temperature and the pH values all play a decisive role during the preparation. The investigation of the dielectric properties of nano BaTiO₃ showed that nano BaTiO₃ has the lower sintering temperature and higher dielectric constant compared with common BaTiO₃.On the basis of above study, nano BaTiO₃ was doped into common BaTiO₃. The results indicated that surface microstructure and dielectric properties of BaTiO₃ ceramics are changed. Nano BaTiO₃ greatly promoted the growth of BaTiO₃ grains and grain size is about 100μm. Compared with the common BaTiO₃, the dielectric constant was higher sintering temperature was lower. In addition when 1wt% nano BaTiO₃ and MnCO3 was added into the common BaTiO₃, during the sintered process MnCO3 inhibits the growth of BaTiO₃ grains, nano BaTiO₃ makes ceramics become more dense.The method of electrophoretic deposition was studied to prepare BaTiO₃. The results showed that dense film of BaTiO₃ can be successfully prepared when using the mixture of acetylacetone and ethanol as suspended solution system, concentration of BaTiO₃ being 10g/L, and electrophoretic depositing at 50V for 5 minutes. In order to avoid the cracks of the resulted film after it was sintered, multiple deposition method was adopted, and SEM proved that this method was effective. The dielectric constant of the prepared BaTiO₃ thin film shows the similar temperature properties with the BaTiO₃ ceramic.Basing this study, nano BaTiO₃ was produced successfully and dense BaTiO₃ film were prepared by electrophoretic deposition method.