Synthesis of PZT Crystalline Powders by Reaction of Aqueous Solution below 200°C

Crystalline powder of Pb(Zr0.52Ti0.48)O3 (PZT) was synthesized from Pb(NO3)2, ZrOCl2 and TiCl4 in KOH solution below 200°C. The PZT formation was strongly affected by the concentration of KOH and temperature. The reaction was accelerated by KOH, and PZT was not obtained in the absence of KOH. At the initial stage of PZT forming reaction, PbTiO3 and PbZrO3 were produced at low KOH concentration, and PbO-TiO2 solid solution was produced at high KOH concentration. PZT formation was very fast in 10M KOH solution, and PZT was the only phase detected by X-ray diffraction within 30min at 200°C, 1h at 150°C, 5h at 100°C or 4d at 70°C. Each PZT particle had a euhedral shape, and was consisted of several crystals. The sizes of crystal and grain changed mainly with reaction temperature.