Morphotropic phase boundary and microstructure of low-temperature sintered PZT ceramics with BiFeO/sub 3/ and Ba(Cu/sub 0.5/W/sub 0.5/)O/sub 3/

摘要

The sintering temperature of the 0.5 wt% MnO/sub 2/-added Pb(Zr/sub 0.53/Ti/sub 0.47/)O/sub 3/ ceramics was successfully lowered down to 935/spl deg/C by the addition of the complex oxides, BiFeO/sub 3/ and Ba(Cu/sub 0.5/W/sub 0.5/)O/sub 3/. This addition may cause a shift of the morphotropic phase boundary (MPB) at which the Pb(Zr,Ti)O/sub 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.