Morphotropic Phase Boundary and Microstructure of Low-Temperature Sintered PZT Ceramics with BiFeO_3 and Ba(Cu_(0.5)W_(0.5))O_3

摘要

The sintering temperature of the 0.5 wt% MnO_2-added Pb(Zr_(0.53)Ti_(0.47))O_3 ceramics was successfully lowered down to 935 ℃ by the addition of the complex oxides, BiFeO_3 and Ba(Cu_(0.5)W_(0.5))O_3. This addition may cause a shift of the morphotropic phase boundary (MPB) at which the Pb(Zr,Ti)O_3 ceramics shows excellent piezoelectric and dielectric properties. Indeed, the XRD studies reveal that the MPB of the ceramics with additives shifts toward the Ti-rich composition. Thus, the electrical properties are affected by this shift of the MPB and the optimum Zr/Ti ratio of 52/48 is determined. Furthermore, the microstructural analyses by using SEM indicate that the additives seem to form stable grain boundaries and the most stable boundaries are obtained with the corresponding composition.