The surge of interest in the search for lead-free alternatives in the past two decades has identified Na_1/2Bi_1/2TiO₃-based materials to exhibit high strain, large mechanical quality factor, high temperature conductivity and temperature-stable permittivity. Nevertheless, the low depolarization temperature (T_d) has been a major concern. This work reports the (1-x)Na_1/2Bi_1/2TiO₃-xBiFeO₃ solid solution processed using the quenching strategy to exhibit high T_d that surpasses that of major Na_1/2Bi_1/2TiO₃ class of materials. Upon quenching the sample, T_d of Na_1/2Bi_1/2TiO₃ with 60 mol% BiFeO₃ considerably increases from 380 °C to 640 °C, while retaining the piezoelectric coefficient, d₃₃ ≈ 57 pC/N. The d₃₃ value is nearly double that of traditional bismuth-layered high temperature piezoelectrics. The role of quenching-induced thermal stability of d₃₃ is substantiated by annealing investigations below 800 °C. The enhancement of T_d is ascribed to the increased latticed distortion and enlarged domain size upon quenching. The practical feasibility of quenching is further substantiated by the similar hardness for the furnace cooled and quenched specimens, indicating comparable mechanical strength.

在过去的二十年中，人们对寻找无铅替代品的兴趣激增，已经确定基于Na _1/2 Bi _1/2 TiO ₃的材料具有高应变、大机械品质因数、高温导电率和温度稳定的介电常数. 然而，低去极化温度（T _d）一直是一个主要问题。这项工作报告了使用淬火策略处理的 (1-x)Na _1/2 Bi _1/2 TiO ₃ -xBiFeO ₃固溶体表现出超过主要 Na _1/2 Bi _1/2 TiO _{3 的}高 T _d类材料。对样品进行淬火后，含有 60 mol% BiFeO ₃的 Na _1/2 Bi _1/2 TiO _{3 的}T _d从 380 °C 显着增加到 640 °C，同时保持压电系数 d ₃₃  ≈ 57 pC/N。d ₃₃值几乎是传统铋层状高温压电体的两倍。d ₃₃的淬火诱导热稳定性的作用通过低于 800 °C 的退火研究得到证实。T _d的增强归因于淬火时晶格畸变增加和畴尺寸扩大。淬火的实际可行性进一步被炉冷和淬火试样的相似硬度证实，表明可比的机械强度。