Nanodomains in KNN‐Based Lead‐Free Piezoelectric ceramics: Origin of Strong Piezoelectric Properties |
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| Authors: | Yu Huan Xiaohui Wang Zhengbo Shen Jingyong Kim Huihua Zhou Longtu Li |
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| Affiliation: | 1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, , Beijing, 100084 China;2. Beijing National Center for Electron Microscopy, School of Materials Science and Engineering, Tsinghua University, , Beijing, 100084 China |
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| Abstract: | Excellent piezoelectric properties of d33* = 768 pm/V and strain = 0.07% at 1 kV/mm, were obtained by lead‐free in (Na0.52K0.4425Li0.0375)(Nb0.86Ta0.06Sb0.08)O3 ceramics. They displayed good temperature stability up to 200°C. Significantly enhanced piezoelectricity originated from nanodomains of width 20–30 nm, and the result was confirmed by transmission electron microscopy. The above‐mentioned nanodomains emerged because of low domain wall energy near polymorphic phase transition regions and insignificant differences in cell parameters between orthorhombic and tetragonal phases. The nanodomain configuration easily responded to an external electric field, leading to high electric field‐induced strain. |
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