Enhanced energy storage properties in La(Mg_1/2Ti_1/2)O₃-modified BiFeO₃-BaTiO₃ lead-free relaxor ferroelectric ceramics within a wide temperature range

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• 作者：Donggeng Zheng ; Ruzhong Zuo ; ^{piezolab@hfut.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; ^{rzzuo@hotmail.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Bismuth ferrite ; Lead-free ceramics ; Relaxor ferroelectrics ; Energy-storage capacitors
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：37
• 期：1
• 页码：413-418
• 全文大小：2072 K

文摘

A new ternary lead-free (0.67-x)BiFeO₃-0.33BaTiO₃-xLa(Mg_1/2Ti_1/2)O₃ ferroelectric ceramic exhibited an obvious evolution of dielectric relaxation behavior. A significantly enhanced energy-storage property was observed at room temperature, showing a good energy-storage density of 1.66 J/cm³ at 13 kV/mm and a relatively high energy-storage efficiency of 82% at x = 0.06. This was basically ascribed to the formation of a slim polarization-electric field hysteresis loop, in which a high saturated polarization P_max and a rather small remnant polarization P_r were simultaneously obtained. Particularly, its energy storage properties were found to depend weakly on frequency (0.2 Hz–100 Hz), and also to exhibit a good stability against temperature (25 °C–180 °C). The achievement of these characteristics was attributed to both a rapid response of the electric field induced reversible ergodic relaxor to long-range ferroelectric phase transition and a typical diffuse phase transformation process in the dielectric maxima.