REACTIVE PZT PRECURSOR POWDER BY COPRECIPITATION

Lead, zirconium and titanium were coprecipitated from their aqueous sa lt solutions using oxalic acid. The precipitate on heating to 850 degr ees C gave phase pure PZT powder which showed good sinterability. The average grain size in the pellets sintered at 900 degrees C for 6 h wa s about 1 mu m. Barium and strontium were found to coprecipitate with lead facilitating partial substitution. Barium modified samples showed a lowering of the Curie temperature from 355 to 230 degrees C while s trontium modified samples showed a lowering from 355 to 245 degrees C for 15 mol% substitution.