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Related Concept Videos

Network Covalent Solids02:18

Network Covalent Solids

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.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Metallic Solids02:37

Metallic Solids

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. Many...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
The Seven Crystal Systems: Overview01:24

The Seven Crystal Systems: Overview

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 requirements are not imposed on the...
Carbon Skeletons01:12

Carbon Skeletons

Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...
Electron Configurations02:46

Electron Configurations

Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
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Related Experiment Video

Updated: May 22, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Four superhard carbon allotropes: a first-principles study.

Chaoyu He1, Lizhong Sun, Chunxiao Zhang

  • 1Laboratory for Quantum Engineering and Micro-Nano Energy Technology, Xiangtan University, Xiangtan 411105, China.

Physical Chemistry Chemical Physics : PCCP
|May 12, 2012
PubMed
Summary
This summary is machine-generated.

Four novel sp(3) carbon allotropes were discovered using a genetic algorithm. These new materials exhibit remarkable stability and superhard mechanical properties, comparable to diamond, with distinct electronic band gaps.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Solid State Physics

Background:

  • Carbon allotropes, such as diamond and graphite, possess unique properties.
  • Discovering new carbon allotropes is crucial for advancing materials science and technology.
  • Previous research has focused on specific ring structures, limiting the exploration of novel forms.

Purpose of the Study:

  • To propose and characterize novel sp(3) carbon allotropes with unique ring structures.
  • To investigate the stability, mechanical, and electronic properties of these proposed allotropes.
  • To compare their properties with existing carbon phases and diamond.

Main Methods:

  • Utilized a generalized genetic algorithm for structure prediction.
  • Employed first-principles calculations for property evaluation.
  • Systematically analyzed stability, mechanical, and electronic characteristics.

Main Results:

  • Successfully proposed four new sp(3) carbon allotropes: 5-6-7-type (Z-ACA, Z-CACB) and 4-6-8-type (Z4-A(3)B(1), A4-A(2)B(2)).
  • Demonstrated exceptional stability for the new allotropes compared to recently proposed carbon phases.
  • Characterized electronic properties: direct band gaps of 2.261 eV (Z-ACA) and 4.196 eV (Z-CACB), and indirect band gaps of 3.105 eV (Z4-A(3)B(1)) and 3.271 eV (A4-A(2)B(2)).
  • Identified all four allotropes as superhard materials with mechanical properties comparable to diamond.

Conclusions:

  • The proposed sp(3) carbon allotropes represent significant additions to the known carbon phases.
  • Their superior stability and superhard nature suggest potential applications in demanding environments.
  • The diverse electronic band gaps indicate potential for use in semiconductor devices.