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Single-bonded cubic form of nitrogen
Mikhail I Eremets1, Alexander G Gavriliuk, Ivan A Trojan
1Max Planck Institute für Chemie, Postfach 3060, 55020 Mainz, Germany. eremets@mpch-mainz.mpg.de
Nature Materials
|July 6, 2004
Summary
Researchers synthesized a new form of nitrogen, cubic gauche nitrogen (cg-N), featuring single covalent bonds like diamond. This metastable material boasts high stiffness and over five times the energy capacity of current energetic materials.
Area of Science:
- Materials Science
- Chemistry
- Physics
Background:
- Nitrogen typically exists as diatomic molecules with strong triple bonds.
- Previous research focused on amorphous non-molecular nitrogen, likely a mixture of clusters.
- Theoretically predicted polymeric nitrogen with single bonds remained elusive.
Purpose of the Study:
- To synthesize and characterize a novel allotropic form of nitrogen with single covalent bonds.
- To investigate the structure and properties of this new nitrogen phase.
- To explore its potential as a high-energy-density material.
Main Methods:
- Synthesis of nitrogen under extreme conditions using a laser-heated diamond cell.
- Achieving temperatures above 2,000 K and pressures above 110 GPa.
- Characterization via X-ray and Raman scattering.
Main Results:
- Successful synthesis of a cubic phase of nitrogen, identified as cubic gauche nitrogen (cg-N).
- Confirmation of a structure with single covalent bonds, analogous to diamond.
- Determination of a high bulk modulus (>or=300 GPa), indicating a stiff covalent solid.
- Observation of metastability, contrasting with amorphous nitrogen.
- Discovery of cg-N's high energy capacity, exceeding existing energetic materials by over fivefold.
Conclusions:
- The synthesis of cg-N represents a significant breakthrough in nitrogen allotropes.
- This new material is a metastable, stiff, single-bonded nitrogen solid.
- cg-N offers exceptional energy storage potential, opening new avenues for energetic materials research.