Structure and piezoelectric properties of K0.5Na0.5NbO3 based lead-free piezoceramics with slight deviation from A-site K or Na stoichiometry |
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| Authors: | Qing Ma Bingbing Wan Lijin Cheng Shaojun Liu Fusheng Liu |
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| Affiliation: | 1.Key Laboratory of Low-carbon Energy and Energy-saving Technology,Research Institute of Tsinghua University in Shenzhen,Shenzhen,China;2.State Key Laboratory for Powder Metallurgy,Central South University,Changsha,China;3.School of Materials Science and Engineering,Shenzhen University,Shenzhen,China |
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| Abstract: | The dependence of structure and piezoelectric response d33 on individual excess A-site K or Na in K0.5Na0.5NbO3 based lead-free piezoceramics is reported. The coexistence of orthorhombic, tetragonal, and monoclinic phases at room temperature is observed in the investigated 0.94K0.5+xNa0.5NbO3–0.06LiNbO3 and 0.94K0.5Na0.5+yNbO3–0.06LiNbO3 ceramics (x, y = 0–0.025). The weight ratio of three phases, orthorhombic-tetragonal phase transition temperature, and d33 value are highly sensitive to A-site K or Na nonstoichiometry. A-site Na nonstiochiometry plays a dominant role in enhancing the electrical properties of KNN by significantly reducing the weight ratio percentage of monoclinic phase and shifting the orthorhombic-tetragonal phase transition temperature to lower temperatures. |
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