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Amorphous silica-like carbon dioxide.

Mario Santoro1, Federico A Gorelli, Roberto Bini

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Researchers synthesized a novel amorphous form of carbon dioxide (a-CO2), termed

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Carbon dioxide (CO2) typically forms double bonds with oxygen.
  • Unlike silica (SiO2) and germania (GeO2), amorphous CO2 has not been synthesized at ambient conditions.
  • Previous amorphous CO2 forms were only theoretical, predicted by simulations.

Purpose of the Study:

  • To synthesize and characterize a novel amorphous, silica-like form of carbon dioxide (a-CO2).
  • To investigate the structural and bonding changes in CO2 under high pressure and temperature.
  • To determine if a-CO2 is structurally homologous to other group IV dioxide glasses.

Main Methods:

  • Compression of molecular CO2 (phase III) between 40 and 48 GPa at room temperature.
  • Analysis using infrared spectroscopy to observe bond formation and molecular signatures.
  • Characterization using Raman spectroscopy and synchrotron X-ray diffraction for amorphous structure confirmation.

Main Results:

  • Successful synthesis of a non-molecular, amorphous form of carbon dioxide ('a-carbonia').
  • Observed transformation from C=O double bonds to C-O single bonds under pressure.
  • Confirmed amorphous structure and structural homology with amorphous silica and germania.

Conclusions:

  • The class of network-forming disordered systems now includes amorphous carbon dioxide (a-CO2).
  • This discovery expands our understanding of group IV dioxides and their amorphous phases.
  • a-CO2 represents a new material with potential applications in materials science.