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Large Piezoelectricity in Ternary Lead‐Free Single Crystals
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2019-11-18 , DOI: 10.1002/aelm.201900949 Yaojin Wang 1 , Chengtao Luo 2 , Shuhao Wang 1 , Chao Chen 3, 4 , Guoliang Yuan 1 , Haosu Luo 4 , Dwight Viehland 2
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2019-11-18 , DOI: 10.1002/aelm.201900949 Yaojin Wang 1 , Chengtao Luo 2 , Shuhao Wang 1 , Chao Chen 3, 4 , Guoliang Yuan 1 , Haosu Luo 4 , Dwight Viehland 2
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Since industry‐standard piezoelectric materials, such as lead zirconium titanate ceramics, contain toxic lead, a rapid surge in research on lead‐free piezoelectric materials is occurring due to concerns over environmental safety and human health. A ternary lead‐free (Na0.5Bi0.5)TiO3‐BaTiO3‐(K0.5Na0.5)NbO3 single crystal with a large field induced strain of ≈0.9% and a giant piezoelectric coefficient d33 of 840 pC N−1 at room temperature is reported. It is revealed that the electric‐field‐induced phase transition and phase boundary between energetically comparable polar states (i.e., R3c and P4mm) play an important role in achieving the ultrahigh piezoelectricity. Transmission electron microscopy and scan probe microscopy are employed to verify the weak‐polar ferroelectric R3c and P4bm structure in the ground state. These unprecedentedly high piezoelectric properties make lead‐free ternary single crystals a leading candidate for piezoelectric‐based device applications, especially toward the era of smart homes and implantable medical devices.
中文翻译：
三元无铅单晶中的大压电
由于行业标准的压电材料（例如钛酸锆钛酸铅陶瓷）含有有毒的铅，出于对环境安全和人类健康的关注，无铅压电材料的研究正在迅速兴起。一种三元无铅（Na 0.5 Bi 0.5）TiO 3 ‐BaTiO 3 ‐（K 0.5 Na 0.5）NbO 3单晶，具有大的场致应变≈0.9％，并且压电系数d 33为840 pC N -1报告在室温下。结果表明，电场诱导的相变和能量可比的极性状态（即，R 3c和P 4mm）在实现超高压电方面起着重要作用。透射电子显微镜和扫描探针显微镜用于验证基态的弱极性铁电体R 3c和P 4bm结构。这些无与伦比的高压电性能使无铅三元单晶成为基于压电的设备应用的领先候选者，尤其是在智能家居和可植入医疗设备时代。
更新日期：2020-01-13
中文翻译：
三元无铅单晶中的大压电
由于行业标准的压电材料（例如钛酸锆钛酸铅陶瓷）含有有毒的铅，出于对环境安全和人类健康的关注，无铅压电材料的研究正在迅速兴起。一种三元无铅（Na 0.5 Bi 0.5）TiO 3 ‐BaTiO 3 ‐（K 0.5 Na 0.5）NbO 3单晶，具有大的场致应变≈0.9％，并且压电系数d 33为840 pC N -1报告在室温下。结果表明，电场诱导的相变和能量可比的极性状态（即，R 3c和P 4mm）在实现超高压电方面起着重要作用。透射电子显微镜和扫描探针显微镜用于验证基态的弱极性铁电体R 3c和P 4bm结构。这些无与伦比的高压电性能使无铅三元单晶成为基于压电的设备应用的领先候选者，尤其是在智能家居和可植入医疗设备时代。
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