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首页> 外文期刊>Journal of Materials Research >Effect of (Bi_(0.5)K_(0.5))TiO_3 on the electrical properties, thermal and fatigue behavior of (K_(0.5)Na_(0.5))NbO_3-based lead-free piezoelectrics
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Effect of (Bi_(0.5)K_(0.5))TiO_3 on the electrical properties, thermal and fatigue behavior of (K_(0.5)Na_(0.5))NbO_3-based lead-free piezoelectrics

机译：（Bi_（0.5）K_（0.5））TiO_3对（K_（0.5）Na_（0.5））NbO_3基无铅压电材料的电性能，热性能和疲劳性能的影响

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摘要

The (1 - x)[0.94(K_(0.5)Na_(0.5))NbO_3-0.06LiNbO_3]-x(Bi_(0.5)K_(0.5))TiO_3 (abbreviated as: KNLN6-xBKT, x = 0-0.05) lead-free piezoelectric ceramics were prepared using conventional solid sintering method. The effects of BKT on the phase structure, electrical properties, temperature stability, and fatigue behavior of KNLN6 ceramics were systematically studied. Results show that BKT substitution into KNLN6 induces a phase transition from coexistence of orthorhombic and tetragonal phases to a single tetragonal phase with a normal-relaxor ferroelectric transformation and correspondingly shifts the polymorphic phase transition below room temperature. Accordingly, the temperature stability of the properties is significantly improved, and a flat, temperature stable behavior over the temperature range of 25-150 ℃ is observed in BKT-modified ceramics. Temperature-dependent structural analysis suggests that the good properties insensitive to temperature of the modified samples can be ascribed to the stable tetragonal phase over a wide temperature range, evident by the almost unchanged tetragonality cla ratio with temperature. Moreover, the BKT-modified ceramics not only exhibit temperature-independent characteristic but also possess fatigue-free behavior. All the electric parameters, including unipolar/bipolar strain S, remnant polarization P_r, permittivity ε_r, and large signal d_(33)~*, display no degradation up to 105 switching cycles. The exceptionally good fatigue resistance and temperature stable behavior make the modified KNN-based materials excellent candidates for lead-free actuators and transducers.
机译：（1-x）[0.94（K_（0.5）Na_（0.5））NbO_3-0.06LiNbO_3] -x（Bi_（0.5）K_（0.5））TiO_3（缩写为：KNLN6-xBKT，x = 0-0.05）采用常规的固体烧结法制备了无铅压电陶瓷。系统地研究了BKT对KNLN6陶瓷的相结构，电性能，温度稳定性和疲劳行为的影响。结果表明，将BKT替换为KNLN6会导致从正交相和四方相的共存转变为具有正弦弛豫铁电相变的单个四方相，并相应地将多态相变移至室温以下。因此，性能的温度稳定性得到显着改善，并且在BKT改性的陶瓷中，在25-150℃的温度范围内观察到平坦的温度稳定行为。温度相关的结构分析表明，对改性样品温度不敏感的良好特性可以归因于在宽温度范围内的稳定四方相，这与温度随温度的几乎不变的四边形cla比率而明显。此外，BKT改性的陶瓷不仅表现出与温度无关的特性，而且还具有无疲劳性能。所有的电参数，包括单极/双极应变S，残余极化P_r，介电常数ε_r和大信号d_（33）〜*，在105个开关周期内均无衰减。出色的抗疲劳性和温度稳定性能使改性KNN基材料成为无铅执行器和传感器的理想选择。

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  • 来源
    《Journal of Materials Research》 |2015年第13期|2018-2029|共12页
  • 作者

    Jigong Hao; Zhijun Xu; Ruiqing Chu; Wei Li; Juan Du;

  • 作者单位

    College of Materials Science and Engineering, Liaocheng University, Liaocheng, Shandong Province 252059, People's Republic of China;

    College of Materials Science and Engineering, Liaocheng University, Liaocheng, Shandong Province 252059, People's Republic of China;

    College of Materials Science and Engineering, Liaocheng University, Liaocheng, Shandong Province 252059, People's Republic of China;

    College of Materials Science and Engineering, Liaocheng University, Liaocheng, Shandong Province 252059, People's Republic of China;

    College of Materials Science and Engineering, Liaocheng University, Liaocheng, Shandong Province 252059, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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