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相关概念视频

Metallic Solids02:37

Metallic Solids

18.1K
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...
18.1K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.0K
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...
14.0K
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

34.0K
VSEPR Theory for Determination of Electron Pair Geometries
34.0K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

9.5K
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...
9.5K
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...
13.6K
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)...
41.0K

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相关实验视频

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3D Depth Profile Reconstruction of Segregated Impurities Using Secondary Ion Mass Spectrometry
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使用多目标差异演化算法预测三维和二维Ga2O3的晶体结构.

Lei Wang1, Danling Wang1, Zian Chen1

  • 1College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, China. xulina@wzu.edu.cn.

Physical chemistry chemical physics : PCCP
|May 20, 2025
PubMed
概括

研究人员使用计算方法预测了新的氧化 (Ga2O3) 晶体结构. 这些稳定的结构显示了先进的高功率和光电子设备的潜力.

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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
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科学领域:

  • 凝聚物质物理学 凝聚物质物理学
  • 材料科学 是一种材料科学.
  • 计算材料科学 计算材料科学

背景情况:

  • 氧化 (Ga2O3) 是一种宽带间隙半导体,具有用于高功率电子和深紫外线光电子的巨大潜力.
  • 预测稳定的晶体结构对于理解和利用新材料至关重要.

研究的目的:

  • 预测和选新的三维 (3D) 和二维 (2D) 氧化 (Ga2O3) 晶体结构.
  • 评估预测的Ga2O3结构的稳定性和电子/光学特性.

主要方法:

  • 使用多目标差异演化算法与密度函数理论 (DFT) 计算相结合.
  • 预测了11个3D和4个2DGa2O3结构.
  • 通过参数,声子光谱,弹性常数和模块来评估结构稳定性.

主要成果:

  • 成功预测了15个新的Ga2O3结构.
  • 确定了两个符合已知的β-Ga2O3和α-Ga2O3相的低能3D结构,证实了它们的稳定性.
  • 确定稳定的3D和2DGa2O3结构都具有宽带间隙和有利的光学特性.

结论:

  • 这项研究为预测的Ga2O3结构的稳定性提供了理论验证.
  • 这些发现为基于Ga2O3的材料的合理设计提供了关键的见解.
  • 这些结果指导了Ga2O3在先进的微电子和光电设备中的应用.