The Effects of Ta Substitution and K/Na Ratio Variation on the Microstructure and Properties of (K,Na)NbO3-Based Lead Free Piezoelectric Ceramics |
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| Authors: | Xunzhong Shang Jinming Guo Wanping Xiao Yinmei Lu Gang Chang Taosheng Zhou Yunbin He |
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| Affiliation: | 1. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Key Laboratory of Green Preparation and Application for Functional Materials, Ministry of Education, Faculty of Materials Science and Engineering, Hubei University, Wuhan, 430062, China
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| Abstract: | [(Na0.5+y K0.5?y )0.94Li0.06][(Nb0.94Sb0.06)1?x Ta x ]O3 + 0.08 mol% MnO2 lead-free piezoelectric ceramics were fabricated successfully by a conventional solid-state reaction method. The effects of Ta5+ substitution and K/Na ratio variation on the microstructure and properties of the ceramics have been systematically investigated. With the increasing of Ta5+ substitution content, the orthorhombic–tetragonal transition temperature T o–t presents obvious “V” type variation while the Curie temperature T c decreases monotonically. The ceramics properties were further enhanced by adjusting the Na/K ratio of the A-site. Under systematical optimization of the A-site and B-site elements, good overall electrical properties of d 33 = 276 pC/N, k p = 44.5%, ε 33 T /ε 0 = 1,175, tanδ = 0.027, T c = 309 °C, P r =21.0 μC/cm2, and E c = 1.14 kV/mm were obtained for ceramics with Ta5+ content x of 0.05 and Na/K ratio of 57/43 (y = 0.07). |
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