Electrical Properties and Relaxor Phase Evolution of Li-Modified BNT-BKT-BT Lead-Free Ceramics

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• 作者：Dong-Sheng Yin ; Zhi-Hao Zhao ; Ye-Jing Dai ; Zhe Zhao ; Xiao-Wen Zhang and Si-Hui Wang
• 刊名：Journal of the American Ceramic Society
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：99
• 期：7
• 页码：2354-2360
• 全文大小：2099K
• ISSN：1551-2916

文摘

By conventional ceramics sintering technique, the lead-free 0.85Bi_0.5Na_0.5(1−x)Li_0.5xTiO₃-0.11Bi_0.5K_0.5TiO₃-0.04BaTiO₃ (x =0–0.15) piezoelectric ceramics were obtained and the effects of Li dopant on the piezoelectric, dielectric, and ferroelectric properties were studied. With increasing Li addition, the temperature-dependent permittivity exhibited the normal ferroelectric-to-ergodic relaxor (FE-to-ER) transition temperature (T_FE-ER, abbreviated as T_F-R) decreasing down to room temperature. The increasing Li content also enhanced the diffuseness of the FE-to-ER transition behavior. For composition with x = 0.15, a large unipolar strain of 0.37% (line-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML">lic">d33∗ = S_max/E_max = 570 pm/V) was achieved under 6.5 kV/mm applied electric field at room temperature. Both unipolar and bipolar strain curves related to the temperature closely, and when the temperature reached the T_F-R, the normalized strain line-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML">lic">d33∗ achieved a maximum value (e.g., for x = 0.10, line-library/content/render" xmlns="http://www.w3.org/1998/Math/MathML">lic">d33∗ = 755 pm/V) owing to the electric-field-induced ER-to-FE state transition.