Electric Field-Induced Phase Transition Behaviors, Thermal Depolarization, and Enhanced Pyroelectric Properties of (Pb0.97La0.02)(ZrxSn0.89 - xTi0.11)O3 Ceramics

(Pb0.97La0.02)(ZrxSn0.89 - Ti-x(0.11))O-3 (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 fieldinduced 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 T-d increased with a linear relationship of T-d = 842x-483. Enhanced pyroelectric coefficient with a value of 12.1 mu C/cm(2)/K was obtained at 88 degrees C for the ceramics with x = 0.68, which was four times larger than the reported values. Composition-dependent pyroelectric response over 24 degrees C-140 degrees C was realized by changing x from 0.60 to 0.74. The results also suggested that the enhanced pyroelectric response near T-d was accompanied by a release of large P-r, caused by an induced ferroelectric to AFE phase transition.