Abstract: The highly pure、superfine and monosize-distribution strontium titanate crys- talline particles have been synthesized by fractional precipitation, when titanium tetrachlo-ride and strontium chloride were used as raw materials and urea and sodium hydroxide asprecipitation agents.The influences of the precipitation agents on formation of the particlesand properties of the powders have been discussed.The results show that urea as the firstprecipitation agent improves the sphericity of the particles and monosize-distribution.Sodi-um hydroxide as precipitation agent is favarable to the crystallization and yield of strontiumtitanate- Particle sizes down to 30 nm on average were obtained.The powders show a goodsinterability.

Key words: strontium titanate, superfine powder, monodispersed particle, fractional precipitation