(1-x)(Bi0.5Na0.5)TiO3-xBa(Zr 0.055Ti0.945)O3 (0 ≤ x ≤ 0.12) lead-free ceramics have been prepared and the morphotropic phase boundary (MPB) is confirmed to be x = 0.06-0.09. The MPB composition x = 0.07 shows enhanced pyroelectric properties from room temperature (RT) to the depolarization temperature Td (87°C), with the pyroelectric coefficient p = 0.057 μC/cm2°C and the figures of merit Fi = 203 pm/V, Fv = 0.022 m2/C, and Fd = 10.5 μPa-1/2 at RT and the highest pyroelectric coefficient of 2.21 μC/cm2°C near Td. These values are superior to other lead-based/lead-free pyroelectric ceramics. Enhanced pyroelectric properties can be explained by the effects of MPB and ferroelectric- antiferroelectric phase transition.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)