Lead-free ceramics with both high piezoelectric response and good temperature stability are urgently demanded for electromechanical conversion devices. Unfortunately, owing to coexistence of polymorphic phases near room temperature (RT), enhanced piezoelectric properties were usually achieved with occurrence of strong temperature dependence in modified BaTiO₃ (BT)-based ceramics. In this work, we demonstrate that tailoring grain orientations of tetragonal BT-based ceramics can effectively produce substantially enhanced and thermally stabilized piezoelectric response. Both <001>_c- and <111>_c-oriented tetragonal (Ba_0.85Ca_0.15) (Zr_0.05Ti_0.95)O₃ (BCZT) ceramics with texture degrees F>90% were synthesized via templated grain growth. Interestingly, the ceramics textured along the <001>_c polar axis show much higher microscopic and macroscopic piezoelectric properties than those with nonpolar <111>_c texture, indicating an “extender” ferroelectricity nature. Compared with randomly oriented samples, the <001>_c-oriented ceramics exhibit simultaneously ∼1.6 times higher piezoelectric strain d₃₃∗ (∼760 pm/V), 4.4 times higher piezoelectric figure of merit d₃₃×g₃₃ (8.8 × 10⁻¹² m²/N), and better temperature stability (strain variation ≤5% between RT and 110 °C). Such thermally stabilized strain response can be mainly attributed to wide temperature range of tetragonal phase and stable domain structure. This work provides a promising route for further developing lead-free piezoceramics with high and temperature-insensitive performance, which can greatly broaden their application areas.

机电转换器件迫切需要具有高压电响应和良好温度稳定性的无铅陶瓷。不幸的是，由于在室温 (RT) 附近多晶型相共存，通常在改性 BaTiO ₃ (BT) 基陶瓷中出现强烈的温度依赖性，从而提高压电性能。在这项工作中，我们证明了调整四方 BT 基陶瓷的晶粒取向可以有效地产生显着增强和热稳定的压电响应。<001> _c - 和 <111> _c取向的四方 (Ba _0.85 Ca _0.15 ) (Zr _0.05 Ti _0.95 )O ₃(BCZT) 具有织构度F > 90% 的陶瓷是通过模板晶粒生长合成的。有趣的是，沿<001> _c极轴织构的陶瓷比具有非极性<111> _c织构的陶瓷表现出更高的微观和宏观压电性能，表明具有“扩展”铁电性质。与随机取向的样品相比，<001> _c取向陶瓷同时表现出约 1.6 倍的压电应变d ₃₃ * (约 760 pm/V)，压电品质因数d ₃₃ × g ₃₃ (8.8 × 10 ^{- 12} 米²/N）和更好的温度稳定性（RT 和 110 °C 之间的应变变化 ≤5%）。这种热稳定的应变响应主要归因于四方相的宽温度范围和稳定的畴结构。这项工作为进一步开发具有高温和温度不敏感性能的无铅压电陶瓷提供了一条有希望的途径，可以大大拓宽其应用领域。