The effect of electric poling on the piezoelectric properties of the sintered Na_0.4K_0.1Bi_0.5TiO₃ is studied with varying poling field and temperature. An optimized poling condition (E_P =50 kVcm, T_P =110 °C) exhibited a high piezoelectric voltage (g₃₃∼ 85 mV m/N) and charge coefficients (d₃₃∼193pC/N). A combination of electric field induced irreversible transformation from polar nano regions embedded in a non-polar relaxor state to a long-range ordered ferroelectric state and increase in the structural ordering are responsible for the observed high piezoelectric properties. A mechanism is discussed to reveal the origin of high voltage coefficient due to poling, where the decrease of dielectric permittivity can facilitate high g₃₃. This investigation provides an approach for designing the high performance Na_0.4K_0.1Bi_0.5TiO₃based materials suitable for sensors and energy harvesting applications.

研究了在极化场和温度变化的情况下，电极化对烧结Na _0.4 K _0.1 Bi _0.5 TiO ₃压电性能的影响。优化的极化条件（Ë _P = 50 kVcm，Ť _P = 110℃）表现出高的压电电压（克₃₃〜85毫伏米/ N）和电荷系数（d ₃₃〜193pC / N）。电场引起的不可逆的转变，从嵌入非极性弛豫态的极性纳米区域到长程有序铁电态以及结构有序性的增加是观察到的高压电性能的原因。讨论了一种机制来揭示由于极化引起的高电压系数的起因，其中介电常数的降低可以促进高g ₃₃。这项研究提供了一种设计适合传感器和能量收集应用的高性能Na _0.4 K _0.1 Bi _0.5 TiO ₃基材料的方法。