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Pure iron compressed and heated to extreme conditions
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics.
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2007 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 99, no 16, 165505- p.Article in journal (Refereed) Published
Abstract [en]

The results of a first-principles study supported by the temperature-quenched laser-heated diamond anvil-cell experiments on the high-pressure high-temperature structural behavior of pure iron are reported. We show that in contrast to the widely accepted picture, the face-centered cubic (fcc) phase becomes as stable as the hexagonal-close-packed (hcp) phase at pressures around 300-360 GPa and temperatures around 5000-6000 K. Our temperature-quenched experiments indicate that the fcc phase of iron can exist in the pressure-temperature region above 160 GPa and 3700 K, respectively. This, in particular, means that the actual structure of the Earth's core may be a complex phase with a large number of stacking faults.

Place, publisher, year, edition, pages
2007. Vol. 99, no 16, 165505- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-143227DOI: 10.1103/PhysRevLett.99.165505ISI: 000250296000045OAI: oai:DiVA.org:uu-143227DiVA: diva2:389762
Available from: 2011-01-20 Created: 2011-01-20 Last updated: 2011-01-20Bibliographically approved

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