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相关概念视频

Colors and Magnetism03:02

Colors and Magnetism

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 eye.

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相关实验视频

Updated: Jul 12, 2026

Atom Probe Tomography Studies on the Cu(In,Ga)Se2 Grain Boundaries
09:51

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Published on: April 22, 2013

贝塔到α-CuAlCl(4) 阶段过渡的动力学和机制:一个时间解析的 (63) Cu MAS 核磁共振和粉末X射线衍射研究.

H Liu1, R M Sullivan, J C Hanson

  • 1Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, USA.

Journal of the American Chemical Society
|August 2, 2001
PubMed
概括

研究人员使用核磁共振和X射线衍射研究了CuAlCl(4) 阶段过渡. 他们发现了一级过渡,其激活能量为138kJ/mol,由离子扩散和离子层重组驱动.

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory

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Last Updated: Jul 12, 2026

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09:51

Atom Probe Tomography Studies on the Cu(In,Ga)Se2 Grain Boundaries

Published on: April 22, 2013

High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Processing of Bulk Nanocrystalline Metals at the US Army Research Laboratory
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Published on: March 7, 2018

科学领域:

  • 固态化学 固态化学
  • 材料科学是一种材料科学.
  • 核磁共振光谱学 核磁共振光谱学

背景情况:

  • CuAlCl(4) 存在于不同的β和α相,具有不同的结构安排.
  • 了解相位过渡对于材料的开发和应用至关重要.

研究的目的:

  • 描述CuAlCl中β到α相过渡的情况.
  • 为了研究这种转换的动力学和机制.
  • 探索在环境温度下诱导相变的方法.

主要方法:

  • 固态 (27) Al和 (63) Cu神奇角度旋转的核磁共振 (MAS NMR).
  • 在现场时间解析 (63) Cu MAS NMR.
  • 同步射线X射线衍射. 同步射线X射线衍射.

主要成果:

  • 不同的 (63) Cu NMR光谱解析了CuAlCl的β和α相.
  • 100°C以上的过渡是第一阶段过渡,没有中间阶段.
  • 根据一级的阿弗拉米-埃罗费耶夫率定律,激活能量被确定为138kJ/mol.
  • 提出了一个单维的生长机制,涉及Cu(+) 扩散和离子层重组.

结论:

  • 在CuAlCl(4) 中,β到α相的过渡是明确的,并且具有动态特征.
  • 拟议的机制为材料的结构动态提供了洞察力.
  • 在室温下,乙烯可以触发相位转换,这表明了潜在的应用.