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Science 31 October 1997:
Vol. 278. no. 5339, pp. 831 - 834
DOI: 10.1126/science.278.5339.831
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Reports

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

D. Andrault, * G. Fiquet, M. Kunz, F. Visocekas, D. Häusermann

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 Al2O3- and SiO2-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 Pbcm for an orthorhombic lattice, and the atomic topology is close to that of epsilon  hexagonal close-packed iron.

D. Andrault and F. Visocekas, Institut de Physique du Globe, Paris 75252, France.
G. Fiquet, Ecole Normale Supérieure de Lyon, Lyon 69364, France.
M. Kunz and D. Häusermann, European Synchrotron Radiation Facility, Grenoble, 38043, France.
*   To whom correspondence should be addressed. E-mail: andrault{at}ipgp.jussieu.fr

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