Lead-free Ag1-3xLaxNbO3 antiferroelectric ceramics with high-energy storage density and efficiency
Lead-free Ag1-3xLaxNbO3 antiferroelectric ceramics with high-energy storage density and efficiency
复制标题
具有高储能密度和效率的无铅Ag1-3x La x NbO3反铁电陶瓷
DOI：
10.1111/jace.16309
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发表时间：
2019-08-01
影响因子：
3.9
通讯作者：
Wei, Yuezhou
中科院分区：
文献类型：
--
作者：
Luo, Nengneng;Han, Kai;Wei, Yuezhou
具有高可恢复能量密度 (W-rec) 的环保无铅块状陶瓷在先进脉冲功率电容器中非常有吸引力。本工作采用成分工程，通过La3+改性来提高Ag1-3xLaxNbO3陶瓷的储能性能。结果发现，La3+ 取代后，反铁电 (AFE) 相变得稳定，这是由于公差因子 t 降低的结果。在230 kV/cm电场下，W-rec和储能效率（eta）显着提高，值为3.12 J/cm(3)和0.63（x = 0.02），是纯AgNbO3值的1.5倍以上（W-rec = 1.9 J/cm(3)，eta = 0.40）。优异的储能性能是由于反铁电-铁电相变电场(E-F)、铁电-反铁电相变电场(E-A)和击穿电场(E-b)的增加而产生的。 E-b 的增强归因于 La3+ 改性后晶粒尺寸的减小和电阻率的增加。该特性使 Ag1-3xLaxNbO3 成为储能应用的潜在候选者。
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 La3+ modification to improve the energy storage performance of Ag1-3xLaxNbO3 ceramics. It was found that the antiferroelectric (AFE) phase was stabilized after La3+ substitution, as a result of the reduced tolerance factor t. Significant improvement of W-rec and energy storage efficiency (eta) 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 AgNbO3 (W-rec = 1.9 J/cm(3), eta = 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 La3+ modification. The feature makes Ag1-3xLaxNbO3 a potential candidate for energy storage applications.