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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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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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2D Antimony-Arsenic Alloys.

Matthieu Fortin-Deschênes1, Olga Waller1, Qi An2

  • 1Department of Engineering Physics, École Polytechnique de Montréal, C. P. 6079, Succursale Centre-Ville, Montréal, QC, H3C 3A7, Canada.

Small (Weinheim an Der Bergstrasse, Germany)
|December 28, 2019
PubMed
Summary

Researchers demonstrate the first 2D antimony arsenide (2D-AsxSb1-x) alloy, expanding the possibilities for group V 2D materials. This controlled synthesis opens doors for new electronic and photonic applications.

Keywords:
2D materialsGroup Vantimonenearsenenein situ electron microscopymolecular beam epitaxyvan der Waals growth

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Alloying group V 2D materials offers a pathway to tune physical properties.
  • Black arsenic-phosphorus is the only experimentally realized 2D group V alloy.
  • Other 2D group V alloys remain largely theoretical.

Purpose of the Study:

  • To demonstrate the synthesis of a new 2D group V alloy: antimony arsenide (AsxSb1-x).
  • To confirm the atomic mixing and composition of the synthesized alloy.
  • To investigate the stability and growth control of this novel 2D material.

Main Methods:

  • Molecular beam epitaxy (MBE) for 2D-AsxSb1-x growth on semiconductor and graphene substrates.
  • Low-energy electron diffraction (LEED) to verify atomic structure.
  • Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) for compositional analysis.

Main Results:

  • Successful synthesis of 2D antimony arsenide (AsxSb1-x) alloy.
  • Confirmation of As and Sb atomic mixing within the 2D lattice.
  • Linear dependence of As content on deposition rates, reaching up to 15 at% As.
  • Observed stability in ambient conditions for weeks, followed by oxidation.

Conclusions:

  • This work presents the first experimental realization of 2D antimony arsenide, a novel group V 2D alloy.
  • The study establishes a foundation for controlled growth and alloying of group V 2D materials.
  • This advancement is crucial for exploring fundamental properties and enabling new applications in 2D material-based devices.