Jiao Shulin, Yang Zhu, Jiao Peijie, Wu Yuying, Tang Zheng, Li Dong, Gao Zhangran, Sun Xiaofan, Cai Hong-Ling, Wu X S
Collaborative Innovation Centre of Advanced Microstructures, Laboratory of Solid-State Microstructures, School of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
Jiangsu Key Laboratory for Artificial Functional Materials, and Collaborative Innovation Center of Advanced Microstructures, Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, People's Republic of China.
Inorg Chem. 2021 Nov 15;60(22):17212-17218. doi: 10.1021/acs.inorgchem.1c02536. Epub 2021 Nov 4.
Organic-inorganic hybrid ferroelectrics (OIHFs) have fueled enormous interest benefiting from their less environmental pollution, performance-tailored functionality, low product costs as well as tunability of structures. However, the lack of material synthesis approaches and diverse targeted molecular design is a stumbling block for designing novel OIHFs rationally. Here, we report a unique organic-inorganic hybrid ferroelectric (3,3-difluoropyrrolidine)CdCl and another novel nonferroelectric crystal (3,3-difluoropyrrolidine)CdCl by changing various crystallization solvents. Significantly, presents a ferroelectric phase transition behavior at ∼367 K, and the distinct symmetry breaking, i.e., , sets up a biaxial ferroelectric with four equivalent directions of polarization, which has a ∼ 0.77 μC/cm. Systematic studies prove that ferroelectricity can be ascribed to the synergistic effects of the distortion of the inorganic anion skeleton and the ordering of organic cations. This work reveals the potential of constructing novel ferroelectrics based on the solvent selective effect and pyrrolidinium as organic cations.
有机-无机杂化铁电体（OIHFs）因其环境污染小、功能可定制、产品成本低以及结构可调性等优点而备受关注。然而，缺乏材料合成方法和多样的靶向分子设计是合理设计新型OIHFs的绊脚石。在此，我们通过改变各种结晶溶剂，报道了一种独特的有机-无机杂化铁电体（3,3-二氟吡咯烷）CdCl以及另一种新型非铁电晶体（3,3-二氟吡咯烷）CdCl。值得注意的是，在约367 K时呈现铁电相变行为，且明显的对称性破缺，即建立了具有四个等效极化方向的双轴铁电体，其极化强度约为0.77 μC/cm²。系统研究表明，铁电性可归因于无机阴离子骨架畸变和有机阳离子有序化的协同效应。这项工作揭示了基于溶剂选择效应和吡咯烷鎓作为有机阳离子构建新型铁电体的潜力。
