High-Pressure Iron-Sulfur Compound, Fe 3 S 2 , and Melting Relations in the Fe-FeS System

Author:

Fei Yingwei1,Bertka Constance M.1,Finger Larry W.1

Affiliation:

1. Geophysical Laboratory and Center for High Pressure Research, Carnegie Institution of Washington, 5251 Broad Branch Road, NW, Washington, DC 20015, USA.

Abstract

An iron-sulfur compound (Fe 3 S 2 ) was synthesized at pressures greater than 14 gigapascals in the system Fe-FeS. The formation of Fe 3 S 2 changed the melting relations from a simple binary eutectic system to a binary system with an intermediate compound that melted incongruently. The eutectic temperature in the system at 14 gigapascals was about 400°C lower than that extrapolated from Usselman's data, implying that previous thermal models of Fe-rich planetary cores could overestimate core temperature. If it is found in a meteorite, the Fe 3 S 2 phase could also be used to infer the minimum size of a parent body.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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