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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.9K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.9K
Structures of Solids02:22

Structures of Solids

14.3K
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 Crystal Structures02:42

Ionic Crystal Structures

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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.
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...
14.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.9K
Crystal Field Theory
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.
CFT focuses on...
26.9K
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

43.3K
Tetrahedral 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,...
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Updated: Aug 3, 2025

Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction

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Crystalline-Amorphous Nanostructures: Microstructure, Property and Modelling.

Bingqiang Wei1, Lin Li2, Lin Shao3

  • 1Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.

Materials (Basel, Switzerland)
|April 13, 2023
PubMed
Summary
This summary is machine-generated.

Crystalline-amorphous nanostructures combine the strengths of crystalline metals and amorphous materials. These advanced materials offer enhanced strength, stability, and radiation tolerance for demanding applications.

Keywords:
crystalline–amorphous nanocompositesmicrostructuremodellingproperties

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Crystalline metals offer good deformability but lack strength and irradiation tolerance.
  • Amorphous materials possess high strength and irradiation tolerance but exhibit poor deformability.
  • Refining characteristic sizes enhances crystalline metal strength and amorphous material deformability.

Purpose of the Study:

  • To review crystalline-amorphous nanocomposites.
  • To discuss synthesis, deformation, and modeling of these materials.
  • To highlight the benefits of combining crystalline and amorphous phases.

Main Methods:

  • Review of existing literature on crystalline-amorphous nanocomposites.
  • Analysis of synthesis methods for nanolaminates, core-shell, and dual-phase structures.
  • Examination of deformation behaviors and multiscale modeling approaches.

Main Results:

  • Crystalline-amorphous nanostructures exhibit enhanced strength and improved plastic flow stability.
  • High-density interfaces effectively trap radiation-induced defects.
  • Interfaces accommodate free volume fluctuations, improving material resilience.

Conclusions:

  • Crystalline-amorphous nanocomposites represent a promising class of materials.
  • Tailoring microstructure is key to optimizing properties.
  • Further research in synthesis, characterization, and modeling is warranted.