一个与矿相关的三维化物铁电
Han-Yue Zhang1, Xian-Jiang Song1, Hao Cheng2
1Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, People's Republic of China.
Journal of the American Chemical Society
|February 25, 2020
概括
研究人员发现了一种新的3D化物铁电材料,Pb2Cl6 ([TMAEA]Pb2Cl6). 这种新型化合物具有出色的铁电性和半导体性质,扩大了3D混合化物应用的可能性.
科学领域:
- 材料科学
- 固态化学
- 晶体学
背景情况:
- 三维 (3D) 有机-无机化物,如[CH3NH3]PbI3矿,对于光电子非常重要.
- 由于3D化物的稀缺性和有争议的铁电性,限制了它们的应用.
- 开发具有强大的铁电性质的新型3D化物材料至关重要.
研究的目的:
- 报告一种新的3D化物铁电材料的发现和特征.
- 研究新化合物的铁电和半导体特性.
- 扩大用于先进应用的3D混合化物库.
主要方法:
- 单晶X射线衍射以确定晶体结构.
- 温度依赖的粉末X射线衍射以研究相位过渡.
- 铁电歇斯底里循环测量以确认铁电.
- 紫外线-Vis光谱测定频段间隙.
主要成果:
- 合成了与矿相关的新型3D化物铁电,Pb2Cl6 ([TMAEA]Pb2Cl6).
- 该材料在412K时呈现铁电到电相位过渡.
- 在293K观察到1μC/cm2的自发偏振和明显的域切换.
- 该化合物具有3.43 eV的直接带间隙的半导体行为.
结论:
- [TMAEA]Pb2Cl6是第一个显示出优异铁电性的3D化物.
- 这一发现丰富了三维混合化物家族.
- 这一发现鼓励对3D化物铁电材料进行进一步的探索.
相关概念视频
02:42Ionic Crystal Structures
16.6K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
16.6K
03:02Colors and Magnetism
13.6K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
13.6K