High-performance piezoelectric materials, whose displacement is sensitive to an external field and vice versa, are constantly required in electromechanical applications. Here, we introduce Nd³⁺ ions into 0.49Pb(Nb_2/3Ni_1/3)O₃-0.51Pb(Hf_0.3Ti_0.7)O₃ (PNN-PHT) ceramics via the solid-state method. By constructing a ferroelectric system in the morphotropic phase boundary region and exploiting the synergistic effect of polar nanoregions and an enhanced local structural heterogeneity, excellent piezoelectricity and dielectric properties are obtained. The optimized piezoelectric coefficient d₃₃, dielectric constant ε₃₃, electromechanical coupling factor k_p, and dielectric loss tanδ are 1125 pC/N, 8667, 0.66, and 1.94%, respectively. The Vogel-Fulcher law and relaxation analysis were adopted to understand the origin of the high piezoelectricity. The Rayleigh analysis method was used to study the intrinsic and extrinsic contributions to the piezoelectricity of the Nd-doped PNN-PHT ceramics, the extrinsic contribution was found to be up to 19% in the optimal region (PNN-PHT + 0.4 at% Nd₂O₃). Moreover, according to in-situ ferroelectric measurements and fatigue measurements, the PNN-PHT + 0.4 at% Nd₂O₃ ceramic exhibits excellent fatigue resistance and stable piezoelectric behavior at 60 ℃. This work provides an approach to realize high-performance piezoelectric ceramics with good electromechanical stability under external condition, which is expected to expand the range of application of piezoelectric materials, e.g., for transducers.

机电应用中不断需要高性能压电材料，其位移对外部场敏感，反之亦然。在这里，我们通过固态方法将Nd ³⁺离子引入0.49Pb(Nb _2/3 Ni _1/3 )O ₃ -0.51Pb(Hf _0.3 Ti _0.7 )O _{3 (PNN-PHT)陶瓷中。}通过在准同性相界区域构建铁电系统并利用极性纳米区域的协同效应和增强的局部结构异质性，获得了优异的压电性和介电性能。优化后的压电系数d ₃₃，介电常数ε ₃₃、机电耦合系数k _p和介电损耗tanδ分别为1125 pC/N、8667、0.66和1.94%。采用 Vogel-Fulcher 定律和弛豫分析来了解高压电的起源。采用瑞利分析方法研究了 Nd 掺杂 PNN-PHT 陶瓷的压电性的内在和外在贡献，发现在最佳区域外在贡献高达 19%（PNN-PHT + 0.4 at% Nd ₂ O ₃）。此外，根据原位铁电测量和疲劳测量，PNN-PHT + 0.4 at% Nd ₂ O ₃陶瓷在 60 ℃时表现出优异的抗疲劳性和稳定的压电行为。这项工作提供了一种在外部条件下实现具有良好机电稳定性的高性能压电陶瓷的方法，有望扩大压电材料的应用范围，例如用于换能器。