Chemical composition and tolerance factor at the morphotropic phase boundary in (Bi0.5Na0.5)TiO3-based piezoelectric ceramics |
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| Authors: | Wei-Chih Lee Chi-Yuen Huang Liang-Kuo Tsao Yu-Chun Wu |
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| Affiliation: | 1. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;2. University of Chinese Academy of Sciences, Beijing 100039, China;3. School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China;4. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;5. Department of Physics Education, Pusan National University, Pusan 609735, South Korea;1. School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China;2. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;3. Key Laboratory of Inorganic Function Material and Device, Chinese Academy of Sciences, Shanghai 201800, China;1. Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany;2. School of Mechanical and Advanced Materials Engineering, UNIST, Ulsan, Republic of Korea;3. Materials Technology Center, Murata Manufacturing Company Ltd, Japan;4. Ceramics Laboratory, Institute of Materials, School of Engineering, EPFL, Lausanne, Switzerland;1. Department of Chemistry, Tsinghua University, Beijing 100084, China;2. State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China;1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;2. Xi’an Chuang Lian Capacitor Co., Ltd., Xi’an 710065, China |
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| Abstract: | A quantitative relation between the morphotropic phase boundary (MPB) composition and the tolerance factor (t) in (Bi0.5Na0.5)TiO3 (BNT)-based piezoelectric ceramics was established. The t value of the MPB compositions in BNT-based ceramics is around 0.990–0.993 and is independent of the types of added compounds. In order to experimentally demonstrate it, two piezoelectric ceramic systems (1 ? x)(Bi0.5Na0.5)TiO3–x(Ba1?aSra)TiO3, a = 0.05 and 0.3 (BNBST5-x and BNBST30-x, x < 12%), were used. X-ray diffraction patterns and the lattice parameter investigations revealed that these two systems formed solid solutions within the studied stoichiometry and showed a rhombohedral–tetragonal phase transformation. Furthermore, both the structure analysis and electric properties measurements indicated that the MPB compositions were BNBST5-6 and BNBST30-8 and their corresponding t value were 0.9900 and 0.9903, respectively. The results confirm the relation between the MPB composition and t value and provide a method for designing new piezoelectric materials. |
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