Large pyroelectric and energy harvesting properties have been attracting increasing attentions due to the practical applications in infrared detectors and energy harvesting technologies. Ferroelectric-antiferroelectric (FE-AFE) phase transitions are usually accompanied by a sharp drop in polarization, which will lead to excellent pyroelectric properties and energy harvesting density. Therefore, FE-AFE phase boundary design is an effective strategy to develop new pyroelectric materials. In this paper, Pb(Lu_1/2Nb_1/2)O₃-PbTiO₃ (PLN-PT) single crystals with FE-AFE phase transitions were obtained by molten salt growth method. The temperature-induced FE-AFE phase transition was verified by temperature-dependent macrodomain structure, DSC curves and dielectric properties. Obviously, PLN-PT crystals display excellent peak pyroelectric coefficient (∼6.8 μC/(cm²·K)) with a maximum depolarization temperature of 118 °C. Meanwhile, the pyroelectric energy harvesting density is as high as 2.62 J/cm³, which is much higher than other pyroelectric materials. The results reveal that the PLN-PT crystal is a promising candidate for infrared detectors and energy harvesting devices.

由于红外探测器和能量收集技术的实际应用，大热释电和能量收集特性越来越受到关注。铁电-反铁电 (FE-AFE) 相变通常伴随着极化的急剧下降，这将导致优异的热电性能和能量收集密度。因此，FE-AFE 相界设计是开发新型热释电材料的有效策略。在本文中，Pb(Lu _1/2 Nb _1/2 )O ₃ -PbTiO ₃通过熔盐生长法获得具有 FE-AFE 相变的 (PLN-PT) 单晶。温度诱导的 FE-AFE 相变通过与温度相关的宏观结构、DSC 曲线和介电特性进行了验证。显然，PLN-PT 晶体显示出优异的峰值热释电系数（~6.8 μC/(cm ² ·K)），最大去极化温度为 118 °C。同时，热释电能量收集密度高达2.62 J/cm ³，远高于其他热释电材料。结果表明，PLN-PT 晶体是红外探测器和能量收集设备的有希望的候选者。