The Orthorhombic Structure of Iron: An in Situ Study at High-Temperature and High-Pressure

DOI Web Site 14 Citations
  • D. Andrault
    D. Andrault and F. Visocekas, Institut de Physique du Globe, Paris 75252, France.
  • G. Fiquet
    D. Andrault and F. Visocekas, Institut de Physique du Globe, Paris 75252, France.
  • M. Kunz
    D. Andrault and F. Visocekas, Institut de Physique du Globe, Paris 75252, France.
  • F. Visocekas
    D. Andrault and F. Visocekas, Institut de Physique du Globe, Paris 75252, France.
  • D. Häusermann
    D. Andrault and F. Visocekas, Institut de Physique du Globe, Paris 75252, France.

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Description

<jats:p> An in situ angle-dispersive x-ray diffraction study was undertaken of iron in a laser-heated, diamond-anvil cell up to 2375 kelvin and between 30 and 100 gigapascals in Al <jats:sub>2</jats:sub> O <jats:sub>3</jats:sub> - and SiO <jats:sub>2</jats:sub> -pressure media. The resolution and reliability of diffraction peak intensities allow quantitative assessment of a structural model. The results confirm that iron undergoes a phase transformation at high pressures and temperatures. The space group is <jats:italic>Pbcm</jats:italic> for an orthorhombic lattice, and the atomic topology is close to that of ɛ hexagonal close-packed iron. </jats:p>

Journal

  • Science

    Science 278 (5339), 831-834, 1997-10-31

    American Association for the Advancement of Science (AAAS)

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