PREPARATION OF STOICHIOMETRIC FINE LEAD BARIUM-TITANATE POWDER

Lead barium titanate powder with 0.03-0.15 mum particle sizes was prep ared from lead barium titanyl oxalate which was previously prepared by reacting high-purity ammonium titanyl oxalate with barium and lead ac etate. The critical factor in preparing the barium titanyl oxalate was the reaction time. It was necessary to allow 2-4 h to synthesize the oxalate to get a single-phase barium titanate. The critical factors in preparing the lead titanyl oxalate were pH and the concentration of t he solution. It was necessary to adjust the pH to around 0.5 and the c oncentration to <0.08M. When lead barium titanyl oxalate is prepared, low pH, low concentration, and a long reaction time are necessary.