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Related Experiment Videos

Six-fold coordinated carbon dioxide VI.

Valentin Iota1, Choong-Shik Yoo, Jae-Hyun Klepeis

  • 1Lawrence Livermore National Laboratory, Livermore, California 94551, USA. iota1@llnl.gov

Nature Materials
|December 13, 2006
PubMed
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Under high pressure and temperature, carbon dioxide (CO2) transforms into extended solid phases, revealing fundamental similarities with silicon dioxide (SiO2). This discovery challenges our understanding of CO2

Area of Science:

  • Geochemistry
  • Materials Science
  • Solid-state Chemistry

Background:

  • Carbon dioxide (CO2) is typically a molecular gas, while silicon dioxide (SiO2) is a fundamental covalent mineral.
  • At standard conditions, CO2 and SiO2 exhibit significant differences in their physical and chemical properties.
  • Previous research indicated CO2 can form solid phases analogous to SiO2 under extreme conditions.

Purpose of the Study:

  • To investigate the high-pressure and high-temperature behavior of carbon dioxide.
  • To discover and characterize new extended solid phases of CO2.
  • To explore the fundamental similarities between carbon dioxide and silicon dioxide under extreme conditions.

Main Methods:

  • Isothermal compression of CO2-II phase at pressures above 50 GPa.

Related Experiment Videos

  • Heating samples to temperatures between 530-650 K.
  • X-ray diffraction and structural analysis to determine crystal structure.

    • Main Results:

    • Discovery of a new extended solid phase of CO2, designated as phase VI.
    • Phase VI is a six-fold coordinated, stishovite-like structure (P42/mnm).
    • A phase diagram was proposed, showing transitions to extended-network solids above 40-50 GPa via intermediate phases.

    Conclusions:

    • High-pressure CO2 can form extended covalent solids, structurally analogous to SiO2.
    • This indicates a fundamental similarity between CO2 and SiO2 under extreme conditions.
    • The study provides insights into the phase diagram and structural evolution of CO2 at high pressures.