Spherical perovskite oxide powders, composed of fine particulates, were prepared by using spherical gel powders under hydrothermal conditions. Spherical PbTiO 3 , BaTiO 3 , and SrTiO 3 powders were synthesized from spherical TiO 2 gel powders, and spherical PbZrO 3 powder from spherical ZrO 2 gel powder. Spherical Pb(Zr 0.5 , Ti 0.5 )O 3 and Ba(Zr 0.5 ,Ti 0.5 )O 3 powders were prepared from spherical ZrTiO 4 gel powders. Lead acetate trihydrate, barium hydroxide octahydrate, and strontium hydroxide octahydrate were used as the sources of A‐site ions in each perovskite oxide (ABO 3 ). The spherical TiO 2 and ZrO 2 gel powders were prepared by thermal hydrolysis of titanium tetrachloride and zirconium oxychloride, respectively, and spherical ZrTiO 4 gel powder by thermal hydrolysis of a mixture of them in alcohol‐water mixed solvent. During the hydrothermal treatment, the spherical gel powders retained their spherical shape to produce spherical perovskite oxide powders, composed of nanometer‐sized particulates.
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Choi et al. (1998) studied this question.