Crystallization and Growth Process of Lead Titanate Fine Particles from Alkoxide-Prepared Powders

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Abstract
Lead titanate particles of controlled size around the nanometer range were prepared by hydrolyzing a mixture of the constituent metal alkoxides. The hydrolysate powder was crystallized by calcination into a tetragonally distorted perovskite structure. The hydrolysate started to crystallize by calcination at 470° C for one hour and the increase of the particle size due to the coalescence began at about 530° C. The increase continued beyond 900° C. The particle calcined at temperatures higher than 700° C seemed to become poly-crystalline. X-ray analysis shows that the strain in the particle was less than 0.2%. The smallest size of a well crystallized particle was about 15 nm.