Hydrothermal Synthesis of BaTiO_3 Nanopowders Using TiO_2 Nanoparticles

摘要

Anatase TiO_2 nanoparticles, obtained by hydrolyzing titanium iso-propoxide in distilled water, were used to synthesize BaTiO_3 (BT) nanopowder by the hydrothermal method. When titanium isoprop-oxide was used, BT nanopowder with a low tetragonality of 1.0070 was formed because of the presence of OH" ions in the oxygen sites and Ba vacancies. However, by changing the titanium source from titanium isopropoxide to TiO_2 nanoparticles, a homogeneous BT nanopowder with similar particle size and a high tetragonality of 1.0081 was synthesized. The size of the BT nanopowder particles was decreased by reducing the synthesis time. In particular, the BT nanopowder that was synthesized at 220℃ for 16 h with a Ba/Ti molar ratio of 4.0 exhibited a high tetragonality of 1.0083 and a small particle size of 126.0 nm.