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

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Science  31 Oct 1997:
Vol. 278, Issue 5339, pp. 831-834
DOI: 10.1126/science.278.5339.831

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Abstract

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 isPbcm for an orthorhombic lattice, and the atomic topology is close to that of ɛ hexagonal close-packed iron.

  • * To whom correspondence should be addressed. E-mail: andrault{at}ipgp.jussieu.fr

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