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首页> 外文期刊>RSC Advances >Large strain response and fatigue-resistant behavior in lead-free Bi-0.5(Na0.80K0.20)(0.5)TiO3-(K0.5Na0.5)MO3 (M = Sb, Ta) ceramics
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Large strain response and fatigue-resistant behavior in lead-free Bi-0.5(Na0.80K0.20)(0.5)TiO3-(K0.5Na0.5)MO3 (M = Sb, Ta) ceramics

机译：无铅Bi-0.5（Na0.80K0.20）（0.5）TiO3-（K0.5Na0.5）MO3（M = Sb，Ta）陶瓷的大应变响应和抗疲劳性能

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摘要

(1 - x)Bi-0.5(Na0.80K0.20)(0.5)TiO3-x(K0.5Na0.5)MO3 (M = Sb, Ta) (BNKT20-KNM100x) lead-free piezoelectric ceramics were designed and fabricated using a conventional fabrication process to achieve large strain response in BKNT20-based ceramics. The KNM substitution was found to induce a transition from ferroelectric to relaxor pseudocubic phase, and such transition is accompanied with the significant disruption of ferroelectric order and the shift of the ferroelectric-relaxor transition temperature TF-R down to room temperature. Accordingly, large electric-field-induced strains of 0.39-0.41% (at 80 kV cm(-1), equivalently 488-513 pm(-1) V), which are derived from a reversible field-induced ergodic relaxor to ferroelectric phase transformation, were obtained in 1.25 mol% KNM-modified compositions near the phase boundary. Moreover, an attractive property for application as actuators was obtained in the present system, compositions near the phase boundary with an ergodic relaxor state exhibited fatigue-free behavior after 10(6) cycles. Furthermore, unexpected almost fatigue-free behavior was also observed in 0.5 mol% KNM-modified samples with a typical ferroelectric long-range order. Results of the enhanced activation energy (E-a) for electrical conduction suggest the well-observed fatigue-resistant behavior in the present system should be mainly attributed to the lower defect density. These findings give the current material great opportunity for actuator applications demanding improved cycling reliabilities.
机译：设计并制造了（1-x）Bi-0.5（Na0.80K0.20）（0.5）TiO3-x（K0.5Na0.5）MO3（M = Sb，Ta）（BNKT20-KNM100x）无铅压电陶瓷使用传统的制造工艺来实现基于BKNT20的陶瓷的大应变响应。发现KNM取代引起从铁电到弛豫假立方相的转变，并且这种转变伴随着铁电顺序的显着破坏以及铁电-弛豫转变温度TF-R下降到室温。因此，大的电场感应应变为0.39-0.41％（在80 kV cm（-1）时，等效为488-513 pm（-1）V），这是由可逆的电场感应遍历弛豫器转变为铁电相而产生的。在相边界附近的1.25 mol％KNM改性的组合物中获得了转变。而且，在本系统中获得了作为致动器的应用的吸引人的特性，具有遍历松弛状态的相界附近的组合物在10（6）次循环后表现出无疲劳性能。此外，在具有典型铁电长程顺序的0.5 mol％KNM改性的样品中，还观察到了出乎意料的几乎没有疲劳的行为。增强的激活能（E-a）用于导电的结果表明，在本系统中观察到的抗疲劳性能应主要归因于较低的缺陷密度。这些发现为要求改进的循环可靠性的执行器应用提供了当前的重要材料。

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