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Related Concept Videos

Unit Cells01:18

Unit Cells

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A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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Hybridization of Atomic Orbitals I03:24

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The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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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 conductivity, metallic luster, and malleability....
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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
Imagine taking a large number of identical...
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The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

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Crystals with various point group symmetries belong to different crystal classes, which are synonymous terms. Despite being in the same class, crystals may have distinct shapes, like cubes and octahedra. There are 32 three-dimensional point groups, all of which are systematically divided into seven crystal systems.The basic cubic crystal system, exemplified by NaCl, features orthogonal vectors (α = β = �� = 90°) of equal lengths (a = b = c). When specific...
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Seedless Growth of Bismuth Nanowire Array via Vacuum Thermal Evaporation
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Two-Dimensional Hexagonal Beryllium Sulfide Crystal.

Jin Yu1, Wanlin Guo1

  • 1State Key Laboratory of Mechanics and Control of Mechanical Structures and Key Laboratory for Intelligent Nano Materials and Devices of MOE, Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

The Journal of Physical Chemistry Letters
|August 19, 2015
PubMed
Summary
This summary is machine-generated.

We discovered a new 2D hexagonal beryllium sulfide (h-BeS) sheet with remarkable electronic and thermal properties. This material exhibits excellent stability and potential for diverse applications in nanotechnology.

Keywords:
armchair and zigzag nanoribbonsgiant Stark effecthexagonal beryllium sulfidespin glass statewide-gap semiconductor

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Two-dimensional (2D) materials offer unique electronic and physical properties.
  • Exploring novel 2D materials is crucial for advancing nanotechnology.

Purpose of the Study:

  • To computationally investigate the properties of a new 2D hexagonal beryllium sulfide (h-BeS) sheet.
  • To explore the electronic and magnetic characteristics of h-BeS nanoribbons.

Main Methods:

  • Extensive first-principles calculations were employed.
  • Density Functional Theory (DFT) was used to model the material.

Main Results:

  • The h-BeS sheet exhibits an indirect energy gap of 4.26 eV.
  • It demonstrates outstanding thermodynamic stability up to 1000 K.
  • Armchair nanoribbons are wide-gap semiconductors with a giant Stark effect.
  • Zigzag nanoribbons are metals with a spin glass state and a net magnetic moment of 1.15 μB.

Conclusions:

  • The 2D h-BeS crystal possesses exceptional electronic and magnetic properties.
  • Its stability and unique characteristics suggest potential for advanced applications.
  • These findings may stimulate experimental research in h-BeS.