EFFECT OF COMPOSITION AND SIZE OF CRYSTALLITE ON CRYSTAL PHASE IN LEAD BARIUM-TITANATE

Lead titanate, barium titanate, and lead barium titanate powders (>99. 9% pure), the particle size of which varied from 0.03 to 0.15 mum depe nding on the calcination temperature and the composition, was-prepared from barium lead titanyl oxalate, which was previously prepared by re acting high-purity ammonium titanyl oxalate with barium and lead aceta te. The critical crystallite size of BaTiO3 powder from the cubic to t he tetragonal phase is around 1 mum. Pb0.3Ba0.7TiO3 powder with an ave rage size of 0.057 mum showed the tetragonal phase.