New Lead‐Free (1 − x)(K0.5Na0.5)NbO3–x(Bi0.5Na0.5)ZrO3 Ceramics with High Piezoelectricity |
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Authors: | Zhuo Wang Dingquan Xiao Jiagang Wu Min Xiao Fangxu Li Jianguo Zhu |
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Affiliation: | Department of Materials Science, Sichuan University, , Chengdu, 610064 China |
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Abstract: | For enhancing the piezoelectric properties of ceramics (Bi0.5Na0.5)ZrO3 (BNZ) was used to partially substitute (K0.5Na0.5)NbO3 (KNN). The addition of BNZ changes the symmetry of KNN ceramics from orthorhombic to tetragonal, and finally to rhombohedral phase. A new phase boundary with both rhombohedral–orthorhombic and orthorhombic–tetragonal phase transitions near room temperature is identified for KNN–0.050BNZ ceramics, where optimum electrical properties were obtained: d33 = 360 pC/N, kp = 32.1%, εr = 1429, tanδ = 3.5%, and TC = 329°C. The results indicated a new method for designing high‐performance lead‐free piezoelectric materials. |
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