Synthesis of Pb(ZrxTi1-x)O3 by Freeze Drying Method

Abstract

A lead zirconate titanate (PZT) was prepared by following methods: 1) Solid-Solid reaction between TiO2, ZrO2 and PbO (DRY method), 2) solid-solid reaction between PbO and a mixed oxide prepared by a freeze drying of a mixed solution of titanium nitrate and zirconium nitrate (COMBINATION method), 3) freeze drying of a mixed solution of titanium nitrate, zirconium nitrate and lead nitrate (FULL method). By the DRY method, PbTiO3 was formed as an intermediate product and a single phase PZT was obtained by a firing at HOOT. By the COMBINATION method, the single phase PZT was obtained by a firing at 900°C without the formation of the intermediate product, By the FULL method, the single phase PZT was obtained by a firing at 580°C without the formation of the intermediate product. A compositional fluctuation of PZT prepared by the COMBINATION method and that by the FULL method were not detected by X-ray diffraction analysis. The sinterability of PZT prepared by the COMBINATION method and that by the FULL method were higher than that by the DRY method. The permittivity peak of PZT prepared by the COMBINATION method and that by the FULL method at the Curie temperature were about twice as large as that by the DRY method. © 1990, The Chemical Society of Japan. All rights reserved.