P6H-7 Investigation of Morphotropic Phase Boundary PbTiO3-Bi(MgZr)O3 Based Complex Perovskite Ceramics

Ferroelectric ceramics based on the PbZr(_1-x)O₃-PbTi_xO₃ (PZT) perovskite system have come to dominate the market of ferroelectric and piezoelectric ceramics. The high Curie temperature (T_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, PbTiO₃-BiScO₃ (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)PbTiO₃-(1-x)BiB\´B"O₃ (where B\´=Mg,B"=Zr) perovskite ceramics, denoted as BMZ-PT ceramics.The effect of BiFeO₃ (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.