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Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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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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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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Crystal Growth: Principles of Crystallization01:25

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Metallic Solids

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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.
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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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Organic parallel grouping crystals without grain boundary.

Ying-Xin Ma1, Wen-Hao Li1, Meng-Yan Zhang1

  • 1State Key Laboratory of Bioinspired Interfacial Materials Science, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu, China.

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Summary
This summary is machine-generated.

Researchers developed organic parallel grouping crystals (OPGCs) by controlling solution viscosity to eliminate grain boundaries. This strategy significantly enhances photon transmission efficiency in optoelectronic materials.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Nanotechnology

Background:

  • Organic crystal-based micro/nanostructures are promising for optoelectronics.
  • Challenges exist in creating continuous, lossless interfaces in multicomponent structures due to material differences and technological limits.

Purpose of the Study:

  • To design organic parallel grouping crystals (OPGCs) that enhance photon transmission efficiency.
  • To overcome the limitations of discontinuous interfaces in multicomponent organic structures.

Main Methods:

  • A solution viscosity-induced binuclear co-growth strategy was employed to create OPGCs.
  • Solvent viscosity was precisely regulated (exceeding 0.5 mPa·s) by adjusting cooling rate, solvent type, and concentration.
  • The strategy was tested on small molecules, coordination compounds, and cocrystals.

Main Results:

  • OPGCs were successfully fabricated without grain boundaries between crystals.
  • Eliminating grain boundaries significantly improved interlayer photon transmission efficiency compared to discontinuous interfaces (2.1%).
  • Adjustable transmission efficiency ranging from 21.3% to 54.9% was achieved, dependent on overlap degree.

Conclusions:

  • The symbiotic strategy enables the construction of continuous, lossless interfaces in multicomponent organic crystals.
  • This approach enhances photon transmission efficiency for optoelectronic applications.
  • The method is versatile for various organic materials, including small molecules, coordination compounds, and cocrystals.