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Crystal Field Theory - Octahedral Complexes02:58

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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Tetrahedral Complexes
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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.
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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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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...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Electronic Structure Changes Due to Crystal Phase Switching at the Atomic Scale Limit.

Johan Valentin Knutsson1, Sebastian Lehmann1, Martin Hjort2

  • 1Department of Physics & NanoLund, Lund University , P.O. Box 118, 22 100 Lund, Sweden.

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|September 30, 2017
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Summary

Researchers directly probed the electronic structure of InAs nanowire crystal segments. They found distinct electronic signatures even in single atomic layers, enabling atomistic band structure engineering for quantum confined structures.

Keywords:
InAsSTM/Scrystal phaseelectronic structurenanowirewurtzitezinc blende

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • III-V nanowires exhibit crystal phase switching, enabling quantum well superstructures.
  • Understanding electronic structure variations at atomic scales in these segments is crucial but challenging.

Purpose of the Study:

  • To directly probe the electronic structure of Zinc blende (Zb) segments within Wurtzite (Wz) InAs nanowires.
  • To investigate electronic behavior down to single atomic layer segments.

Main Methods:

  • Low-temperature scanning tunneling microscopy and spectroscopy.
  • Atomic-scale precision probing of InAs nanowire electronic structure.

Main Results:

  • Major band structure features change abruptly at the single atomic layer level.
  • Distinct Zb electronic signatures observed for single InAs bilayer segments.
  • Evidence of confined states in Zb segments, forming quantum wells due to smaller band gap.

Conclusions:

  • Crystal phase switching enables ultimate atomistic band structure engineering.
  • Bulk band gap values are applicable to smallest crystal segments.
  • Suppression of surface/interface states may be necessary for future electronic devices.