Lanthanum-modified lead zirconate titanate ceramics Pb_0.92La_0.08(Zr_yTi_1−y)_0.98O₃ (y = 64.5 ~ 68.0 mol%) were prepared by a hot-press sintering process in this study. Systematic analysis of the microstructure, dielectric, ferroelectric, and electrically induced light scattering properties were carried out. All samples were crystallized into a single perovskite phase with a dense microstructure. The maximum dielectric constants ε_rmax decreased with the Zr/Ti ratio increasing (1 kHz), and the P-E hysteresis loops showed that the remnant polarization (P_r) and the coercive electric field (E_c) were significantly reduced accompanied with the gradually enhanced antiferroelectric-ferroelectric phase transition while the Zr/Ti ratio increasing (measured at room temperature). Noticeably, the threshold electric field of electrically induced light scattering performance (examined at λ = 633nm) significantly decreased as the Zr/Ti ratio decreasing. The PLZT (8/65.5/34.5) ceramics exhibited the optimum electrically induced light scattering performance under a very low threshold electric field.

本研究采用热压烧结工艺制备镧改性锆钛酸铅陶瓷 Pb _0.92 La _0.08 (Zr _y Ti _1−y ) _0.98 O ₃ (y = 64.5 ~ 68.0 mol%)。进行了微观结构、介电、铁电和电致光散射特性的系统分析。所有样品都结晶成具有致密微观结构的单一钙钛矿相。最大介电常数 ε _rmax随 Zr/Ti 比值的增加 (1 kHz) 而降低，PE 磁滞回线表明剩余极化 (P _r ) 和矫顽电场 (E _c) 显着降低，伴随着逐渐增强的反铁电-铁电相变，而 Zr/Ti 比率增加（在室温下测量）。值得注意的是，随着 Zr/Ti 比率的降低，电致光散射性能（在 λ = 633nm 处检查）的阈值电场显着降低。PLZT (8/65.5/34.5) 陶瓷在非常低的阈值电场下表现出最佳的电致光散射性能。