Unprecedented Ferroelectric–Antiferroelectric–Paraelectric Phase Transitions Discovered in an Organic–Inorganic Hybrid Perovskite,Journal of the American Chemical Society

当前位置： X-MOL 学术 › J. Am. Chem. Soc. › 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.)

Unprecedented Ferroelectric–Antiferroelectric–Paraelectric Phase Transitions Discovered in an Organic–Inorganic Hybrid Perovskite
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2017-06-15 00:00:00 , DOI: 10.1021/jacs.7b04693
Peng-Fei Li ₁ , Wei-Qiang Liao ₁ , Yuan-Yuan Tang ₁ , Heng-Yun Ye ₁ , Yi Zhang ₁ , Ren-Gen Xiong ₁

Affiliation

As a promising candidate for energy storage capacitors, antiferroelectric (AFE) materials have attracted great concern due to their congenital advantages of large energy storage ability from double polarization versus electric field (P–E) hysteresis characteristics in contrast to ferroelectrics and linear dielectrics. However, antiferroelectricity has only been discovered in inorganic oxides and some hydrogen-bonded molecular systems. In view of the structural diversity and unique physical properties of organic–inorganic hybrid system, it remains a great opportunity to introduce antiferroelectricity into organic–inorganic hybrid perovskites. Here, we report that polarizable antiparallel dipole arrays can be realized in an organic–inorganic hybrid perovskite, (3-pyrrolinium)CdBr₃, which not only exhibits an excellent ferroelectric property (with a high spontaneous polarization of 7.0 μC/cm²), but also presents a striking AFE characteristic revealed by clear double P–E hysteresis loops. To the best of our knowledge, it is the first time that such successive ferroelectric–antiferroelectric–paraelectric phase transitions have been discovered in organic–inorganic perovskites. Besides, a giant dielectric constant of 1600 even at high frequency of 1000 kHz and a bulk electrocaloric effect with entropy change of 1.18 J K^–1 kg^–1 under 7.41 kV/cm are also observed during the phase transition. Apparently, the combined striking AFE characteristic and giant dielectric constant make (3-pyrrolinium)CdBr₃ a promising candidate for next generation high-energy-storage capacitors.

中文翻译：

有机-无机杂化钙钛矿中发现的前所未有的铁电-反铁电-顺电相变

至于储能电容有希望的候选，反铁电（AFE）材料已经由于从双偏振大型储能能力与电场（其先天的优势吸引了极大的关注P - Ë相反，铁电体和线性电介质的滞后特性）。但是，反铁电仅在无机氧化物和某些氢键分子系统中才发现。鉴于有机-无机杂化体系的结构多样性和独特的物理性质，将反铁电引入有机-无机杂化钙钛矿中仍然是一个巨大的机会。在这里，我们报道了可极化的反平行偶极子阵列可以在有机-无机杂化钙钛矿，（3-吡咯啉）CdBr中实现₃，它不仅表现出优异的强介电特性（具有7.0μC/ cm的高自发极化²），但也呈现出显着的AFE特性揭示明显的双P - ë磁滞回线。据我们所知，这是首次在有机-无机钙钛矿中发现这种连续的铁电-反铁电-顺电相变。此外，即使在1000 kHz的高频下，介电常数也高达1600，并且其热电效应的熵变为1.18 JK ^–1 kg ^–1在相变过程中还观察到低于7.41 kV / cm的电压。显然，惊人的AFE特性和巨大的介电常数相结合使（3-吡咯鎓）CdBr ₃成为下一代高能量存储电容器的有希望的候选者。

更新日期：2017-06-28

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南