Lead titanate, barium titanate, and lead barium titanate powders (>99.9% pure), the particle size of which varied from 0.03 to 0.15 μm depending on the calcination temperature and the composition, was prepared from barium lead titanyl oxalate, which was previously prepared by reacting high‐purity ammonium titanyl oxalate with barium and lead acetate. The critical crystallite size of BaTiO 3 powder from the cubic to the tetragonal phase is around 1 μm. Pb 0.3 Ba 0.7 TiO 3 powder with an average size of 0.057 μm showed the tetragonal phase.
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Saegusa et al. (1993) studied this question.
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