Abstract
Monodispersed, spherical MTiO3(M=Ba, Sr, Pb) fine powders were synthesized by the hydrolysis of metal alkoxide in a mixture of alcohol and dipolar aprotic solvent. Ba-Ti, Sr-Ti or Pb-Ti double alkoxide were used as starting materials. The synthesis factor such as water and alkoxide concentration, type of solvent and reaction temperature influenced particle size, particle size distribution and the state of aggregation. Monodispersed powders were obtained when the volume ratio of octanol to acetonitrile was in the range from 60:40 to 80:20. As-prepared powders were amorphous and then crystallized to a perovskite-type structure by calcination at 600°C. Spherical morphology was retained after calcination at 600°C. Fluoresence X-ray analysis showed that the BaO/TiO2, SrO/TiO2 and PbO/TiO2 ratio of as-prepared powders was 48:52, 49:51 and 49:51, respectively.
