High sinterability of Ca-PZT, synthesized by polymeric and partial oxalate process

摘要

This study includes Ca-PZT in the morphotropic phase boundary, MPB process combining the Pechini method, (ZT) and the Partial oxalate method (Ca-PZT) by obtaining single phase particles of ZT phase with a high specific surface area (∼110 m2/g at 550° C) and narrow particle size distribution. Lead and calcium oxalates were precipitated onto the ZT particle surface and reacted to a solid state interface ZT/Ca-PZT/PbO-CaO. A deviation of a coexistence region from FT- and FR-phases to FR-phase (Zr rich region) was observed. Strong surface area reduction occurs by Ca-PZT crystallization at about 700°C, and demonstrated high sinterability (2.40 m2/g − 350 nm) with apparent densities near to 99.9%. Different processing methods did not demonstrate superior results. Studies of calcined powder shows a high sinterability of powder calcined 3 h at 700° C and sintered 3 h at 1000°C coming up to 99.8% of relative density.