Piezoelectrics are key materials for energy conversion, for example in ultrasound transducers and energy harvesters. This work presents the synthesis and characterization of the lead-free piezoelectric composition (Li_0.06(K_0.52Na_0.48)_0.94)(Nb_0.71Ta_0.29)O₃ doped with 0.25 mol% Mn (KNNLTM) as textured ceramics. Templated grain growth from NaNbO₃ platelet templates aligned by tape casting was used to introduce texture, and after sintering for 14 h at 1100 C this produced up to 84% (100)_pc grain orientation. After high temperature poling, the textured samples exhibit reasonable piezoelectric response with d ₃₃ values up to 171 pC N⁻¹, and k _t values of 0.35, which is 71% of the response obtained in a single crystal of the same composition. The low relative dielectric permittivity of the textured and high temperature-poled KNNLTM (ϵ ₃₃ ^T/ϵ ₀ down to 182) resulted in record-high piezoelectric voltage constants (g ₃₃ up to 101 mV m N⁻¹), higher than previously reported for lead-free piezoelectric ceramics, as well as very high figure of merit (d ₃₃ g ₃₃ up to 16 10⁻¹² m³ J⁻¹) for non-resonant energy harvesting in compression. These numbers make the textured KNNLTM materials of this work highly promising for use in thickness mode, non-resonant piezoelectric energy harvesters.

压电是能量转换的关键材料，例如在超声换能器和能量收集器中。这项工作介绍了无铅压电组合物 (Li _0.06 (K _0.52 Na _0.48 ) _0.94 )(Nb _0.71 Ta _0.29 )O ₃掺杂 0.25 mol% Mn (KNNLTM) 作为织构陶瓷的合成和表征。通过流延法对齐的NaNbO ₃片状模板的模板晶粒生长用于引入织构，并且在 1100 C 下烧结 14 小时后，这产生了高达 84% (100) _{pc 的}晶粒取向。高温极化后，纹理样品表现出合理的压电响应d ₃₃值高达171 pC N ^-1，k _t值为0.35，这是在相同组成的单晶中获得的响应的71%。纹理化和高温极化的 KNNLTM 的低相对介电常数（ϵ ₃₃ ^T / ϵ ₀低至 182）导致了创纪录的高压压电电压常数（g ₃₃高达 101 mV m N ^-1），高于先前报道的用于无铅压电陶瓷，以及非常高的品质因数（d ₃₃ g ₃₃高达 16 10 ^-12 m ³ J ^-1) 用于压缩中的非谐振能量收集。这些数字使这项工作的纹理 KNNLTM 材料非常有希望用于厚度模式、非谐振压电能量收集器。