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Orientation dependence of electric field induced phase transitions in lead-free (Na0.5Bi0.5)TiO3-based single crystals |
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| Authors: | Chao Chen Yaojin Wang Xiangping Jiang Na Tu Yunjing Chen Shulan Zhou Xiang Xia Zongyang Shen Haosu Luo |
| Affiliation: | 1. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi, China;2. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing, China;3. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen, Jiangxi, China
National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen, Jiangxi, China;4. Artificial Crystal Research Center, Shanghai Institute of Ceramics, University of Chinese Academy of Sciences, Jiading, Shanghai, China |
| Abstract: | The orientation dependence of the electric field induced strain and phase transitions in 0.92(Na0.5Bi0.5)TiO3–0.06BaTiO3–0.02(K0.5Na0.5)NbO3 (NBT–6BT–2KNN) single crystals has been investigated. The evolution of Raman spectra with electric field reveals that a tetragonal ferroelectric phase is initially induced at E = 14 kV/cm and completed above E = 25 kV/cm for 001] oriented single crystals. When the electric field is applied along 111] direction, a partial phase transition from pseudocubic to rhombohedral structure is triggered at E = 19 kV/cm, which is higher than that for inducing tetragonal ferroelectric phase along 001] direction. Both field-induced phase structures and stability of NBT–6BT–2KNN single crystal are strongly associated with the crystallographic orientations. These results provide a better understanding to the field-induced macroscopic strain in lead-free NBT-based ferroelectrics. |
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