Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 39, Pages 12042-12045Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1502363112
Keywords
iron melting curve; XAS; megabar range
Categories
Funding
- European Synchrotron Radiation Facility
- National Science Foundation [EAR 1248553]
- Directorate For Geosciences
- Division Of Earth Sciences [1248553] Funding Source: National Science Foundation
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Temperature, thermal history, and dynamics of Earth rely critically on the knowledge of the melting temperature of iron at the pressure conditions of the inner core boundary (ICB) where the geotherm crosses the melting curve. The literature on this subject is overwhelming, and no consensus has been reached, with a very large disagreement of the order of 2,000 K for the ICB temperature. Here we report new data on the melting temperature of iron in a laser-heated diamond anvil cell to 103 GPa obtained by X-ray absorption spectroscopy, a technique rarely used at such conditions. The modifications of the onset of the absorption spectra are used as a reliable melting criterion regardless of the solid phase from which the solid to liquid transition takes place. Our results show a melting temperature of iron in agreement with most previous studies up to 100 GPa, namely of 3,090 K at 103 GPa.
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