Iron Melting at the Physical Conditions of the Core

Details Iron Melting at the Physical Conditions of the Core Iron Melting at the Physical Conditions of the Core

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p41a..04n&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #P41A-04

Computer Science

Sound

1015 Composition Of The Core, 3924 High-Pressure Behavior, 3944 Shock Wave Experiments, 8124 Earth'S Interior: Composition And State (Old 8105)

Scientific paper

We will report new and re-analyzed sound velocity measurements of shock compressed iron at Earth-core conditions. The sound velocity data show that melting starts at 225±3~GPa (5100±500° K) and is complete at 260±3~GPa (6100±500° K), both on the Hugoniot. This is a lower melting pressure than previously reported. Also, no statistically conclusive evidence for a previously reported solid--solid phase transition on the Hugoniot near 200~GPa was observed. We will discuss the implications of these findings on the Fe phase diagram. Our recent efforts on temperature measurement at high pressure-temperature conditions, and dynamic compression along planetary isentrope will also be reported.

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