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Related Concept Videos

Structures of Solids02:22

Structures of Solids

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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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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.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
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X-ray Crystallography02:18

X-ray Crystallography

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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.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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Recrystallization: Solid–Solution Equilibria01:10

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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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...
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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.
Types of Unit Cells
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Homogenizing two-dimensional crystals.

Dongyoung Kim1, Kibum Kang1,2

  • 1Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.

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Summary
This summary is machine-generated.

A single layer of lanthanum atoms acts as a template, guiding semiconductor crystal growth in a specific orientation. This breakthrough in materials science enables precise control over crystal structures.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Crystallography

Background:

  • Controlling crystal orientation is crucial for semiconductor performance.
  • Existing methods for achieving ordered crystal growth can be complex and costly.

Purpose of the Study:

  • To investigate the potential of ultra-thin lanthanum films for directing semiconductor crystal growth.
  • To establish a novel, efficient method for achieving one-dimensional crystal orientation.

Main Methods:

  • Epitaxial growth of semiconductor thin films on a substrate.
  • Utilizing an atomically thin layer of lanthanum as an interfacial layer.
  • Characterization using advanced surface analysis techniques.

Main Results:

  • The atom-thick lanthanum layer effectively templated the growth of semiconductor crystals.
  • Consistent unidirectional orientation of the semiconductor crystal lattice was achieved.
  • The lanthanum layer demonstrated high efficacy in promoting ordered growth.

Conclusions:

  • Lanthanum's unique properties enable precise control over semiconductor crystal orientation.
  • This atomically thin templating method offers a new pathway for fabricating advanced semiconductor materials.
  • Potential applications in electronics and optoelectronics requiring highly ordered structures.