在Q (Q=S,Se,Te) 中的Subchalcogenides Ir2:具有重返结构调制的迪拉克半金属候选物
Jason F Khoury1, Alexander J E Rettie2,3, Iñigo Robredo4,5
1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
研究人员使用金属流量方法合成了基于的新型亚化物晶体. 这些材料具有独特的结构过渡和具有高电子流动性的拓半金属特性.
科学领域:
- 材料科学
- 固态化学
- 凝聚物质物理学
背景情况:
- 亚化物是具有较低金属氧化状态的罕见化合物,是金属间和半导体之间的桥梁.
- 它们独特的结合和结构带来了合成挑战,
- 了解这些材料对于发现新的电子和结构性质至关重要.
研究的目的:
- 合成和描述新的亚硫化合物,特别是Ir2In8Se和Ir2In8Te.
- 研究这些新材料的结构和电性能,并将其与Ir2In8S进行比较.
- 探索这些化合物作为拓半金属的潜力.
主要方法:
- 使用作为金属流体合成单晶.
- 进行X射线晶体学以确定晶体结构并识别相变.
- 测量电荷传输以评估电子移动性和载体度等电气性质.
主要成果:
- 成功合成了Ir2In8Se和Ir2In8Te的毫米级单晶体.
- 这两种化合物与Ir2In8S具有同结构,具有相应调节的低温相转变与基离子的扭曲.
- 观察到重入结构行为,并确定为具有高电子流动性 (~1500 cm2 V-1 s-1) 和中等载体度 (~10^20 cm-3) 的拓半金属候选物.
结论:
- 金属流是一种高质量的新型金属间化物单晶合成的有效方法.
- 合成的Ir2In8Se和Ir2In8Te化合物表现出复杂的结构行为,并具有标志着拓半金属的特性.
- 这些发现为在先进的电子设备中潜在应用的亚素化物开辟了道路.
更多相关视频
04:09Demonstrating the Simplicity and In Situ Temperature Monitoring of the Mechanochemical Synthesis of Metal Chalcogenides Suitable for Thermoelectrics
Published on: August 30, 2024
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
相关概念视频
Ionic Crystal Structures
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...
Valence Bond Theory
Woodward–Hoffmann Selection Rules and Microscopic Reversibility
Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
Crystal Field Theory - Tetrahedral and Square Planar Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Predicting Molecular Geometry
