The low depolarization temperature has hindered implementation of (Na_1/2Bi_1/2)TiO₃ (NBT)-based lead-free piezoceramics in practical application, in particular, in high temperature environment. In this work, the impact of Fe modification on the microstructure, depolarization temperature, ferroelectric and piezoelectric properties of 0.94(Na_1/2Bi_1/2)TiO₃-0.06BaTiO₃ (NBT-6BT) lead-free ceramics were studied. The results illustrates that the piezoelectric constant and depolarization temperature can be significantly tuned by Fe doping, and more importantly, both can be simultaneously enhanced. Compared to the undoped material, the room-temperature piezoelectric constant of NBT-6BT with 1.0 mol% Fe doping increases from 133 pC/N to 164 pC/N, and the depolarization temperature increases from 106 °C to 125 °C. These observations are mainly attributed to the stabilization of ferroelectric order, induced by the enhanced lattice distortion.

低去极化温度阻碍了(Na _1/2 Bi _1/2 )TiO ₃ (NBT)基无铅压电陶瓷在实际应用中的应用，特别是在高温环境中。在这项工作中，Fe改性对0.94(Na _1/2 Bi _1/2 )TiO ₃ -0.06BaTiO ₃的微观结构、去极化温度、铁电和压电性能的影响(NBT-6BT) 无铅陶瓷进行了研究。结果表明，Fe掺杂可以显着调节压电常数和去极化温度，更重要的是，两者可以同时增强。与未掺杂的材料相比，掺杂 1.0 mol% Fe 的 NBT-6BT 的室温压电常数从 133 pC/N 增加到 164 pC/N，去极化温度从 106 °C 增加到 125 °C。这些观察结果主要归因于由增强的晶格畸变引起的铁电有序的稳定。