Preparation of spherical and porous strontium titanate particles by hot water and hydrothermal conversion of hydrous titania.

Uniform, micron-sized SrTiO 3 particles do not tend to aggregate, and the low surface area of larger particles can be improved by incorporating porous structures, thus offering superior performance for a range of applications. In this study, submicron-to micron-sized SrTiO 3 particles were prepared using hot water or hydrothermal conversion of spherical hydrous titania (TiO 2 · n H 2 O) and porous hydrous titania. When spherical hydrous titania particles were employed as the starting material, spherical SrTiO 3 particles of hydrous titania were obtained via treatment at 120 °C for 24 h. Similarly, the use of porous hydrous titania particles treated at 90 °C for 48 h resulted in spherical porous SrTiO 3 particles with macropores of porous hydrous titania. These porous SrTiO 3 particles have a specific surface area of ~115 m2/g, which is one of the largest among micron-sized SrTiO 3 particles, thereby making them suitable for use as catalysts or photocatalysts. [ABSTRACT FROM AUTHOR]