Abstract

Recently, AgNbO₃ antiferroelectric ceramics have attracted great attention by virtue of their characters of high energy storage density and environmental friendliness. To further optimize the electrical properties, in this work, Lu₂O₃ modified AgNbO₃ ceramics were prepared via conventional solid state method. Crystal structure and element analysis indicated the Lu³⁺ ion preferred to enter the A-site when Lu₂O₃ content was lower than 2 mol%, otherwise, it was more likely to form LuNbO₄ or Lu₃NbO₇-based solid solutions. Remarkably improved stability of antiferroelectric phase was observed once Lu³⁺ ions enter into the A-site, on account of the decrease of cell volume and tolerance factor. As a consequence, an enhanced recoverable energy storage density (W_rec) of 3.5 J/cm³ was achieved in 1 mol% Lu₂O₃ modified AgNbO₃ ceramics at 210 kV/cm, which is superior to the other lead-free ceramics under moderate electric field (< 220 kV/cm). It is believed our study will provide a good reference for the development of AgNbO₃-based dielectric capacitors.

中文翻译：

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鲁掺杂对AgNbO 3反铁电陶瓷结构，电性能和储能性能的影响

摘要

近来，AgNbO ₃反铁电陶瓷由于其高储能密度和环境友好性的特性而引起了极大的关注。为了进一步优化电性能，在这项工作中，通过常规的固态方法制备了Lu ₂ O ₃改性的AgNbO ₃陶瓷。晶体结构和元素分析表明，当Lu ₂ O ₃含量低于2 mol％时，Lu ³⁺离子优选进入A位，否则，更可能形成LuNbO ₄或Lu ₃ NbO ₇基于固体的解决方案。由于细胞体积和耐受因子的减少，一旦Lu ³⁺离子进入A位，观察到反铁电相的稳定性显着提高。结果，在210 kV / cm的1 mol％Lu ₂ O ₃改性的AgNbO ₃陶瓷中，可回收的储能密度（W _rec）提高到3.5 J / cm ³，这优于其他无铅陶瓷在中等电场（<220 kV / cm）下。相信我们的研究将为开发基于AgNbO ₃的介电电容器提供良好的参考。