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Area of Science:

  • Condensed matter physics
  • Materials science
  • High-pressure chemistry

Background:

  • Molecular nitrogen (N2) serves as a model system for dense, confined matter.
  • Understanding N2 behavior under extreme conditions is crucial for condensed matter physics.
  • Zeolites offer unique environments for studying molecular interactions under pressure.

Purpose of the Study:

  • To investigate the properties of molecular nitrogen subnanoconfined in a pure SiO2 zeolite under high pressure.
  • To analyze N2-N2 interactions and intramolecular changes within the zeolite confinement.
  • To determine the structural stability of the SiO2 zeolite at extreme pressures.

Main Methods:

  • Raman spectroscopy to probe molecular vibrations and interactions.
  • X-ray diffraction to determine structural changes and crystallinity.
  • High-pressure experiments up to 50 GPa using a diamond anvil cell.

Main Results:

  • Molecular nitrogen confined in SiO2 zeolite exhibited N2-N2 interactions and distances comparable to bulk N2.
  • Intramolecular N2 interactions weakened with increasing pressure.
  • The SiO2 zeolite remained crystalline with silicon in tetrahedral coordination up to 50 GPa, a record for this coordination.
  • A polymerization of N2 molecules was observed within the zeolite microchannels at a pressure threshold similar to bulk N2.

Conclusions:

  • Subnanoconfinement of molecular nitrogen in SiO2 zeolite under pressure leads to behavior analogous to bulk N2.
  • The SiO2 zeolite structure demonstrates remarkable stability at record high pressures.
  • The findings provide insights into pressure-induced polymerization of molecules within confined environments.