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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...
Noble Gases02:54

Noble Gases


The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
Van der Waals Equation01:10

Van der Waals Equation

The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
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Crystal Density01:19

Crystal Density

The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor a simple cubic lattice, atoms are located only at...
¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.

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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Cagelike diamondoid nitrogen at high pressures.

Xiaoli Wang1, Yanchao Wang, Maosheng Miao

  • 1Institute of Condensed Matter Physics, Linyi University, Linyi 276005, People's Republic of China.

Physical Review Letters
|December 11, 2012
PubMed
Summary

Researchers discovered a novel cagelike diamondoid nitrogen structure stable at high pressures. This unique polymeric nitrogen form is the most stable known above 263 GPa, offering potential as a high-energy-density material.

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Synthesis and Microdiffraction at Extreme Pressures and Temperatures
07:26

Synthesis and Microdiffraction at Extreme Pressures and Temperatures

Published on: October 7, 2013

Area of Science:

  • Materials Science
  • Solid-State Physics
  • Computational Chemistry

Background:

  • Molecular nitrogen (N2) transforms into polymeric nitrogen under high pressure.
  • Polymeric nitrogen is a potential high-energy-density material.
  • Discovering stable high-pressure forms of polymeric nitrogen is of significant scientific interest.

Purpose of the Study:

  • To report the discovery and stabilization of a novel cagelike diamondoid nitrogen structure.
  • To investigate the structural and energetic properties of this new nitrogen allotrope.

Main Methods:

  • First-principles structural searches were employed to predict stable nitrogen phases.
  • High-pressure computational modeling was used to analyze the electronic and structural properties.

Main Results:

  • A unique cagelike diamondoid nitrogen structure, termed "diamondoid nitrogen," was identified.
  • This structure adopts a highly symmetric body-centered cubic phase with N(10) cages.
  • Diamondoid nitrogen exhibits a wide energy gap and is the most energetically stable polymeric nitrogen structure above 263 GPa.

Conclusions:

  • The discovery of diamondoid nitrogen represents a significant advancement in understanding solid nitrogen under extreme conditions.
  • This material is energetically stable at experimentally accessible high pressures, suggesting potential applications.
  • The unique diamondoid structure, unprecedented in other elements, expands the knowledge of nitrogen allotropes.