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Related Concept Videos

Metallic Solids02:37

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.
All metallic solids exhibit high thermal and electrical...
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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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Predicting Molecular Geometry02:27

Predicting Molecular Geometry

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VSEPR Theory for Determination of Electron Pair Geometries
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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
Imagine taking a large number of identical...
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Structures of Solids02:22

Structures of Solids

13.6K
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 Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.0K
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)...
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3D Depth Profile Reconstruction of Segregated Impurities Using Secondary Ion Mass Spectrometry
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Crystal structure prediction of three- and two-dimensional Ga2O3 using a multi-objective differential evolution

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Researchers predicted new gallium oxide (Ga2O3) crystal structures using computational methods. These stable structures show potential for advanced high-power and optoelectronic devices.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Computational materials science

Background:

  • Gallium oxide (Ga2O3) is a wide-band-gap semiconductor with significant potential for high-power electronics and deep-ultraviolet optoelectronics.
  • Predicting stable crystal structures is crucial for understanding and utilizing novel materials.

Purpose of the Study:

  • To predict and screen novel three-dimensional (3D) and two-dimensional (2D) gallium oxide (Ga2O3) crystal structures.
  • To evaluate the stability and electronic/optical properties of predicted Ga2O3 structures.

Main Methods:

  • Utilized a multi-objective differential evolution algorithm combined with density functional theory (DFT) calculations.
  • Predicted 11 3D and 4 2D Ga2O3 structures.
  • Assessed structural stability through parameters, phonon spectra, elastic constants, and moduli.

Main Results:

  • Successfully predicted 15 novel Ga2O3 structures.
  • Identified two low-energy 3D structures matching known β-Ga2O3 and α-Ga2O3 phases, confirming their stability.
  • Determined that both stable 3D and 2D Ga2O3 structures possess wide band gaps and favorable optical properties.

Conclusions:

  • The study provides theoretical validation for the stability of predicted Ga2O3 structures.
  • The findings offer crucial insights for the rational design of Ga2O3-based materials.
  • These results guide the application of Ga2O3 in advanced microelectronic and photoelectric devices.