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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.2K
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 conductivity, metallic luster, and malleability....
18.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.1K
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...
14.1K
Structures of Solids02:22

Structures of Solids

14.0K
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...
14.0K
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
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

41.5K
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,...
41.5K
VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

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Effect of Lone Pairs of Electrons on Molecule Geometry
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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Unveiling Trigonal Anti-Prismatic Structure and Stacking Sequences in InTe.

Sangmin Lee1, Young-Kyun Kwon2, Gyu-Chul Yi3

  • 1Department of Materials Science & Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)
|December 2, 2024
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel indium telluride polymorphs using molecular beam epitaxy (MBE). Atomic microscopy revealed unique structures, suggesting potential for diverse symmetries and topological phases in 2D van der Waals materials.

Keywords:
III‐VI metal chalcogenidesindium telluridemolecular beam epitaxyscanning transmission electron microscopytrigonal anti‐prismatic structure

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Polymorphic phases in 2D van der Waals materials are crucial for diverse properties.
  • Synthesizing novel polymorphs and understanding their atomic structures is an active research area.

Purpose of the Study:

  • To synthesize novel polymorphs of indium telluride (a III-VI metal chalcogenide) using molecular beam epitaxy (MBE).
  • To investigate the atomic-level structures, stability, and potential topological properties of these novel polymorphs.

Main Methods:

  • Molecular Beam Epitaxy (MBE) for material growth on graphene substrates.
  • Atomic resolution scanning transmission electron microscopy (STEM) for structural analysis.
  • Density Functional Theory (DFT) calculations for stability and property analysis.

Main Results:

  • Successful synthesis of indium telluride layers exhibiting both trigonal prismatic and trigonal anti-prismatic structures.
  • Observation of novel stacking sequences arising from the coexistence of these polymorphs.
  • DFT calculations confirmed the stability of the unconventional structure and indicated potential topological properties.

Conclusions:

  • Indium telluride, a III-VI metal chalcogenide, can form polymorphs with diverse symmetries and topological phases beyond conventional structures.
  • MBE is a viable technique for synthesizing such complex polymorphs.
  • The findings open avenues for exploring new 2D materials with tailored electronic and topological properties.