A Molecular Perovskite with Switchable Coordination Bonds for High-Temperature Multiaxial Ferroelectrics.
A Molecular Perovskite with Switchable Coordination Bonds for High-Temperature Multiaxial Ferroelectrics.
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DOI：
10.1021/jacs.7b01334
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发表时间：
2017-05
影响因子：
15
通讯作者：
Wei-Jian Xu;Peng-Fei Li;Yuan‐Yuan Tang;Wei-Xiong Zhang;R. Xiong;Xiao‐Ming Chen
中科院分区：
文献类型：
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作者：
Wei-Jian Xu;Peng-Fei Li;Yuan‐Yuan Tang;Wei-Xiong Zhang;R. Xiong;Xiao‐Ming Chen
在分子晶体中，铁电机制的相变主要限于有序-无序和位移类型，而不涉及化学键的断裂。在这里，我们表明，在环境压力下的键切换转变是可设计的分子晶体，并演示如何利用较弱的和可切换的配位键在一种新的分子钙钛矿，[（CH 3）3 NOH]2[KFe（CN）6]（TMC-1），提供一个稀缺的多轴铁电体与高居里温度为402 K和24个等效的铁电方向（超过钛酸钡）。TMC-1的高质量薄膜可以通过简单的溶液工艺容易地制备，并且在宏观和微观尺度上都显示出完美的铁电性质，这表明TMC-1是下一代柔性电子产品中有希望的候选者。提出的分子组装策略和实现的键转铁电机理为设计先进的铁电材料开辟了一条新途径。
The underlying phase transitions of ferroelectric mechanisms in molecular crystals are mainly limited to order-disorder and displacive types that are not involved in breaking of the chemical bonds. Here, we show that the bond-switching transition under ambient pressure is designable in molecular crystals, and demonstrate how to utilize the weaker and switchable coordination bonds in a novel molecular perovskite, [(CH3)3NOH]2[KFe(CN)6] (TMC-1), to afford a scarce multiaxial ferroelectrics with a high Curie temperature of 402 K and 24 equivalent ferroelectric directions (more than BaTiO3). The high-quality thin films of TMC-1 can be easily fabricated by a simple solution process, and to reveal perfect ferroelectric properties at both macroscopic and microscopic scales, suggesting TMC-1 as a promising candidate for applications in next-generation flexible electronics. The presented molecular assembly strategy, together with the achieved bond-switching ferroelectric mechanism, opens a new avenue for designing advanced ferroelectric materials.