Enhanced energy-storage properties of 0.89Bi_0.5Na_0.5TiO₃-0.06BaTiO₃-0.05K_0.5Na_0.5NbO₃ lead-free anti-ferroelectric ceramics by two-step sintering method

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• 作者：Jianxiang Ding ; Yunfei Liu ; Yinong Lu ; Hao Qian ; Hong Gao ; Hu Chen ; Chengjian Ma
• 关键词：0.89BNT&ndash ; 0.06BT&ndash ; 0.05KNN ceramics ; Two-step sintering ; Microstructure ; Electrical properties
• 刊名：Materials Letters
• 出版年：1 January, 2014
• 年：2014
• 卷：114
• 期：Complete
• 页码：107-110
• 全文大小：940 K

文摘

This work compared the effects of different sintering methods on the microstructure and anti-ferroelectric properties of lead-free 0.89Bi_0.5Na_0.5TiO₃-0.06BaTiO₃-0.05K_0.5Na_0.5NbO₃ ternary system ceramics. The ceramics by two-step sintering method had smaller grain size and more uniform microstructure than those of the ceramics by single-step sintering method. The mechanism of grain growth in different sintering methods is discussed. The ceramics by two-step sintering method exhibited better anti-ferroelectricties than those of the ceramics by single-step sintering method. The polarization hysteresis (P-E) loop showed optimum electrical performances with a low remanent polarization (P_r=5.4 渭C/cm²) and a coercive field (E_c=8.2 kV/cm), and the energy density (W) reached 0.90 J/cm³ at 10 Hz. The storage capacity is three times that of the single-step sintering ceramics.