Electric Field-Induced Phase Transition Behaviors, Thermal Depolarization, and Enhanced Pyroelectric Properties of (Pb0.97La0.02)(Zr xSn0.89− xTi0.11)O3 Ceramics.

(Pb0.97La0.02)(Zr xSn0.89− xTi0.11)O3 ( x = 0.60, 0.62, 0.64, 0.66, 0.68, 0.70, 0.72, and 0.74) ceramics with the compositions in tetragonal antiferroelectric (AFE) region, near the morphotropic phase boundary, were prepared by using the conventional solid-state reaction process. Their electric field-induced phase transitional behaviors, composition- and temperature-dependent dielectric, depolarization, and pyroelectric properties were investigated systematically. The AFE to ferroelectric phase switching field EA-F decreased with increasing x, while depolarization temperature Td increased with a linear relationship of Td = 842 x-483. Enhanced pyroelectric coefficient with a value of 12.1 μC/cm2/K was obtained at 88°C for the ceramics with x = 0.68, which was four times larger than the reported values. Composition-dependent pyroelectric response over 24°C-140°C was realized by changing x from 0.60 to 0.74. The results also suggested that the enhanced pyroelectric response near Td was accompanied by a release of large Pr, caused by an induced ferroelectric to AFE phase transition. [ABSTRACT FROM AUTHOR]