当前位置: X-MOL 学术Nanoscale › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Oxygen polyhedral dipole–dipole interaction induced domain reconstruction and relaxor behaviors in layered perovskite films for dielectric energy storage
Nanoscale ( IF 6.7 ) Pub Date : 2021-08-26 , DOI: 10.1039/d1nr03029a
Yueshun Zhao 1 , Bo Yang 1 , Qiong Wu 1 , Yunpeng Zhou 1 , Fei Guo 1 , Shifeng Zhao 1
Affiliation  

We define AO12 and BO6 oxygen polyhedra in layered perovskite films as A–O* and B–O* polyhedral dipoles, respectively, which are responsible for the spontaneous polarization and the construction of domains. Based on the dipole–dipole interaction among such polyhedral dipoles, we propose and deduce the forming domain energy Gk, which decides the evolution of domains. Furthermore, A–O* polyhedral dipoles of three-layered Bi4Ti3O12 are regulated by respectively inserting two layers of SrTiO3 and Sr0.92Ba0.08TiO3 into it to form Sr2Bi4Ti5O18 (SBT) and Ba0.16Sr1.84Bi4Ti5O18 (BSBT) films. It is shown that the domains are reconstructed to form smaller domains due to the decrease of the forming domain energy, which is also embodied in the relaxor characteristics. Likewise, interestingly, the maximum polarization of a BSBT film is enhanced due to the lattice extension derived from A–O* dipole regulation, which brings about improved energy storage performances with the density reaching as high as 102.9 J cm−3 and the efficiency increasing to 64.8%. This work provides a preferred alternative strategy to regulate the relaxor behavior by domain reconstruction for dielectric energy storage.

中文翻译:

用于介电能量存储的层状钙钛矿薄膜中氧多面体偶极-偶极相互作用诱导畴重建和弛豫行为

我们将层状钙钛矿薄膜中的AO 12和 BO 6氧多面体分别定义为 A-O* 和 B-O* 多面体偶极子,它们负责自发极化和域的构建。基于这种多面体偶极子之间的偶极-偶极相互作用,我们提出并推导出了形成域能量G k,它决定了域的演化。此外,通过分别插入两层 SrTiO 3和 Sr 0.92 Ba 0.08 TiO 3形成 Sr 2 Bi来调节三层 Bi 4 Ti 3 O 12 的A–O* 多面体偶极子4 Ti 5 O 18 (SBT) 和 Ba 0.16 Sr 1.84 Bi 4 Ti 5 O 18 (BSBT) 薄膜。结果表明,由于形成域能量的降低,域被重构以形成更小的域,这也体现在弛豫特性中。同样,有趣的是,由于 A-O* 偶极子调节产生的晶格扩展,BSBT 薄膜的最大极化增强,这带来了改进的储能性能,密度高达 102.9 J cm -3效率提高到64.8%。这项工作提供了一种首选的替代策略,通过介电能量存储的域重建来调节弛豫行为。
更新日期:2021-09-21
down
wechat
bug