Chang Yunfei, Wu Jie, Liu Zhen, Sun Enwei, Liu Linjing, Kou Qiangwei, Li Fei, Yang Bin, Cao Wenwu
Condensed Matter Science and Technology Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China.
Mechanics of Functional Materials Division, Department of Materials Science, TU Darmstadt, Darmstadt 64287, Germany.
ACS Appl Mater Interfaces. 2020 Aug 26;12(34):38415-38424. doi: 10.1021/acsami.0c11680. Epub 2020 Aug 12.
High-performance piezoelectrics are pivotal to various electronic applications including multilayer actuators, sensors, and energy harvesters. Despite the presence of high Lotgering factor , two key limitations to today's relaxor-PbTiO textured ceramics are low piezoelectric properties relative to single crystals and high texture temperature. In this work, Pb(YbNb)O-Pb(MgNb)O-PbTiO (PYN-PMN-PT) textured ceramics with ∼ 99% were synthesized at only 975 °C through liquid-phase-assisted templated grain growth, where of particular significance is that single-crystal properties, i.e., very large electrostrain / ∼ 1830 pm V, giant piezoelectric figure of merit × ∼ 61.3 × 10 m N, high electromechanical coupling ∼ 0.90, and Curie temperature ∼ 205 °C, were simultaneously achieved. Especially, the / and × values correspond to ∼180% enhancement as compared to the regularly 1200 °C-textured ceramics with ∼ 96%, representing the highest values ever reported on piezoceramics. Phase-field simulation revealed that grain misorientation has a stronger influence on piezoelectricity than texture fraction. The ultrahigh piezoelectric response achieved here is mainly attributed to effective control of grain orientation features and domain miniaturization. This work provides important guidelines for developing novel ceramics with significantly enhanced functional properties and low synthesis temperature in the future and can also greatly expand application fields of piezoceramics to high-performance, miniaturized electronic devices with multilayer structures.
高性能压电材料对于包括多层致动器、传感器和能量收集器在内的各种电子应用至关重要。尽管存在高洛特林因子，但当今弛豫铁电体 - 钛酸铅织构陶瓷存在两个关键限制，即相对于单晶而言压电性能较低以及织构温度较高。在这项工作中，通过液相辅助模板晶粒生长法在仅975°C的温度下合成了织构度约为99%的Pb(YbNb)O - Pb(MgNb)O - PbTiO（PYN - PMN - PT）织构陶瓷，特别重要的是，同时实现了单晶性能，即非常大的电致应变/约1830 pm V、巨大的压电优值×约61.3×10⁻³ m⁻² N⁻¹、高机电耦合系数约0.90以及居里温度约205°C。特别是，与通常在1200°C织构化且织构度约为96%的陶瓷相比，/和×值提高了约180%，代表了压电陶瓷有史以来报道的最高值。相场模拟表明，晶粒取向差对压电性的影响比织构分数更强。此处实现的超高压电响应主要归因于对晶粒取向特征的有效控制和畴的细化。这项工作为未来开发具有显著增强功能特性和低合成温度的新型陶瓷提供了重要指导，也能极大地扩展压电陶瓷在具有多层结构的高性能、小型化电子器件中的应用领域。
