材料科学
反铁电性
铁电性
自然键轨道
电阻率和电导率
电场
陶瓷
铁电陶瓷
储能
相变
矿物学
分析化学(期刊)
电介质
化学
凝聚态物理
电气工程
冶金
光电子学
热力学
物理
密度泛函理论
工程类
功率(物理)
计算化学
量子力学
色谱法
作者
Nengneng Luo,Kai Han,Laijun Liu,Biaolin Peng,Xinpeng Wang,Changzheng Hu,Huanfu Zhou,Qin Feng,Xiyong Chen,Yuezhou Wei
摘要
Abstract Environmentally benign lead‐free bulk ceramics with high recoverable energy density ( W rec ) are very attractive in advanced pulsed power capacitors. In this work, composition engineering was adopted by La 3+ modification to improve the energy storage performance of Ag 1−3 x La x NbO 3 ceramics. It was found that the antiferroelectric (AFE) phase was stabilized after La 3+ substitution, as a result of the reduced tolerance factor t . Significant improvement of W rec and energy storage efficiency ( η ) were achieved with value of 3.12 J/cm 3 and 0.63 for x = 0.02 at an electric field of 230 kV/cm, more than 1.5 times the value of pure AgNbO 3 ( W rec = 1.9 J/cm 3 , η = 0.40). The excellent energy storage properties are resulted from the increased antiferroelectric‐ferroelectric phase transition electric field ( E F ), ferroelectric‐antiferroelectric phase transition electric field ( E A ), and breakdown electric field ( E b ). The enhanced E b was ascribed to the decreased grain size and increased electrical resistivity upon La 3+ modification. The feature makes Ag 1−3 x La x NbO 3 a potential candidate for energy storage applications.
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