Nano-perovskite nanocrystals were synthesized by a solid-state reaction at low temperature by using TiCl₄ and alkaline-earth metal hydroxides as raw materials. Firstly, highly-active TiO₂•H₂O (H₂TiO₃) was prepared by the hydrolysis of TiCl₄. Then the mixtures of TiO₂•H₂O and alkaline-earth metal hydroxides with molar ratio of 1∶1 were ground for 1 h, and then reacted at a certain temperature. XRD analysis demonstrates that the products are perovskite-type materials. TEM photograph shows that the particles are uniform in shape and dispersed well with average size less than 80 nm in diameter. It can be concluded from XRD patterns that the chemical reaction is the rate-determining step in this low temperature solid state reaction. Furthermore, the formation process of the as-obtained perovskite-type materials were investigated in detail.

Key words: solid-state reaction, nano-perovskite, preparation, mechanism