Investigation of Morphotropic Phase Boundary PbTiO{sub}3-Bi(MgZr)O{sub}3 based Complex Perovskite Ceramics

摘要

Ferroelectric ceramics based on the PbZr{sub}(1-x)O{sub}3-PbTi{sub}xO{sub}3 (PZT) perovskite system have come to dominate the market of ferroelectric and piezoelectric ceramics. The high Curie temperature (T{sub}c) of PZT and small temperature dependence of its Morphotropic Phase Boundary (MPB) composition results in a robust dielectric ceramic. Remarkably, very few perovskite systems have been found to possess ferroelectric and piezoelectric properties comparable to those of PZT. Recently high Curie temperature perovskite system, PbTiO{sub}3-BiScO{sub}3 (BS-PT) at MPB was found to possess excellent piezoelectric and electromechanical properties. These investigations gave us an insight to interpret the structure-property relation in complex (x)PbTiO{sub}3-(1-x)BiB'B"O{sub}3 (where B'=Mg,B"=Zr) perovskite ceramics, denoted as BMZ-PT ceramics. The effect of BiFeO{sub}3 (BF) modification on the structural and ferroelectric properties of MPB composition of BMZ-PT, denoted as BMZ-BF-PT has also been investigated in this work.