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相关概念视频

Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Energy Bands in Solids01:01

Energy Bands in Solids

Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states that no two...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Structures of Solids02:22

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
Electronic Structure of Atoms02:28

Electronic Structure of Atoms


An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum numbers:  n, l, ml, and...

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相关实验视频

Updated: May 10, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

固态化学中的纳米级原子.

Xavier Roy1, Chul-Ho Lee, Andrew C Crowther

  • 1Department of Chemistry, Columbia University, New York, NY 10027, USA.

Science (New York, N.Y.)
|June 8, 2013
PubMed
概括
此摘要是机器生成的。

原子精确的分子集群自组装成具有独特电子和磁性特性的新型固态材料. 这些先进材料表现出激活的电子传输和磁性排序,为新的电子应用铺平了道路.

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Atomically Traceable Nanostructure Fabrication
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Atomically Traceable Nanostructure Fabrication

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

相关实验视频

Last Updated: May 10, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

Published on: September 17, 2017

Atomically Traceable Nanostructure Fabrication
12:35

Atomically Traceable Nanostructure Fabrication

Published on: July 17, 2015

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

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科学领域:

  • 固态化学 固态化学
  • 材料科学是一种材料科学.
  • 纳米技术 纳米技术

背景情况:

  • 原子精确的分子集群为新型材料提供了基石.
  • 富勒伦是超分子化学中的多功能成分.
  • 了解集群组件中的结构-属性关系至关重要.

研究的目的:

  • 从分子集群和富勒伦的二元组合中合成和描述新的固态材料.
  • 研究这些新材料的电子传输特性.
  • 为了探索基于集群的固态化合物的磁性特性.

主要方法:

  • 分子团的二元组合 (例如, [Co6Se8(PEt3) 6], [Cr6Te8(PEt3) 6], Ni9Te6(PEt3) 8) 与富勒伦 (C60).
  • 通过X射线衍射来确定晶体结构,包括酸 (CdI2) 和岩盐结构的超原子亲属.
  • 测量电子传输特性以确定激活能量.
  • 测量磁性易感度,以识别磁性排序.

主要成果:

  • [Co6Se8(PEt3) [6][C60]2和[Cr6Te8(PEt3) [6][C60]2的形成,具有超原子CdI2型结构.
  • 观察这些材料中的激活电子运输,这些材料的激活能量为100-150 meV.
  • 一个与岩盐相关的结构的合成,使用一个更能减少Ni9Te6(PEt3) 8集群,表明显著的电荷转移到C60.
  • 由于集群之间的电子相互作用,在Ni9Te6(PEt38) 基材料中发现了低温的磁顺序相.

结论:

  • 原子精确的分子集群可以与富勒伦二元组装在一起,以创建新的固态材料.
  • 这些材料具有可调节的电子传输和磁性.
  • 形成有序结构和表现出像磁性排序这样的现象的能力突出了基于集群的材料在先进应用中的潜力.