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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 conductivity, metallic luster, and malleability....
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Novel octa-graphene-like structures based on GaP and GaAs.

José A S Laranjeira1, Nicolas F Martins1, Sérgio A Azevedo1,2

  • 1Modeling and Molecular Simulation Group, São Paulo State University (Unesp), Bauru, SP, 17033-360, Brazil.

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|June 6, 2023
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Summary

This study introduces novel two-dimensional materials, octa-gallium arsenide (octa-GaAs) and octa-gallium phosphide (octa-GaP), exhibiting promising electronic and vibrational properties for semiconductor applications. These stable buckled nanosheets pave the way for future experimental synthesis and research.

Keywords:
BucklingGaAsGaPOcta-GaAsOcta-GaPOcta-grapheneT-graphene

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • The discovery of graphene has spurred interest in novel two-dimensional (2D) materials.
  • Octa-graphene, a carbon allotrope with 4- and 8-membered rings, serves as a model for exploring inorganic analogs.
  • Gallium arsenide (GaAs) and gallium phosphide (GaP) are crucial in semiconductor physics.

Purpose of the Study:

  • To computationally propose and characterize two new inorganic buckled nanosheets: octa-gallium arsenide (octa-GaAs) and octa-gallium phosphide (octa-GaP).
  • To investigate the structural, electronic, and vibrational properties of these novel octa-graphene-based materials.
  • To provide fundamental data to guide experimental efforts in synthesizing these predicted 2D materials.

Main Methods:

  • Density Functional Theory (DFT) using the B3LYP hybrid functional, implemented in the CRYSTAL17 code.
  • Triple-zeta valence with polarization (TZVP) basis sets for Ga, As, and P atomic centers.
  • Vibrational analysis via the coupled-perturbed Hartree-Fock/Kohn Sham (CPHF/KS) method and bond analysis using the Quantum Theory of Atoms in Molecules and Crystals (QTAIMC).

Main Results:

  • Octa-GaP and octa-GaAs exhibit indirect band gaps of 3.05 eV and 2.56 eV, respectively, with specific valence band maximum and conduction band minimum locations.
  • QTAIMC analysis reveals incipient covalent bonding in both structures.
  • Vibrational analysis shows distinct Raman active modes (6Ag + 6Bg for octa-GaP, 12A' + 12B″ for octa-GaAs), with symmetry reduction in octa-GaAs activating modes inactive in octa-GaP. Phonon band structure confirms stability, showing no negative frequency modes.

Conclusions:

  • Octa-GaAs and octa-GaP are stable, novel 2D materials with unique electronic and vibrational properties.
  • The predicted properties, including band gaps and bonding characteristics, make them potential candidates for semiconductor applications.
  • This theoretical study provides a foundation for future experimental synthesis and characterization of these promising inorganic octa-graphene analogs.