Thermodynamics of Fe–S at ultra-high pressure |
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| Affiliation: | 1. Center for the Study of Matter at Extreme Conditions, College of Engineering and Computing, Florida International University, Miami, USA;2. Gunnar Eriksson, GTT-Technologies, Kaiserstrasse 100, 52134 Herzogenrath, Germany;1. Central European Institute of Technology, CEITEC MU, Masaryk University, Kamenice 5, 625 00 Brno, Czech Republic;2. Department of Chemistry, Faculty of Science, Masaryk University, Kotlárˇská 2, 611 37 Brno, Czech Republic;3. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, ?i?kova 22, 616 62 Brno, Czech Republic;4. Central European Institute of Technology, CEITEC BUT, Brno University of Technology, Technická 10, 616 00 Brno, Czech Republic;5. Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic;1. Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;2. Geophysical Laboratory, Carnegie Institution of Washington, DC 20015, USA;1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia;2. RISE Project, National Astronomical Observatory of Japan, 2-12, Hoshigaoka, Mizusawa, Oshu, Iwate 023-0861, Japan;3. The Graduate University for Advanced Studies, SOKENDAI, Shonan Village, Hayama, Kanagawa 240-0193, Japan;4. The University of Aizu, Research Center for Advanced Information, Aizu-Wakamatsu, Fukushima Pref. 965-8580, Japan;5. Creative Research Institution, Hokkaido University, Kita 8, Nishi 5, Kita-ku, Sapporo 001-0021, Japan;1. Center for the Study of Matters at Extreme Conditions and Department of Mechanical and Materials Engineering, Florida International University, Miami, FL 33199, USA;2. Center for the High Pressure Science and Technology Advanced Research, Jilin University, Changchun 130021, China;3. Mineral Physics Institute and Department of Geosciences, Stony Brook University, Stony Brook, NY 11794-2100, USA;4. Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL 60637, USA;5. Department of Geology and Geophysics, Yale University, New Haven, CT 06511, USA;1. Department of Earth and Planetary Science, The University of Tokyo, Hongo, Tokyo, 113-0033, Japan;2. Sorbonne Université, Muséum National d''Histoire Naturelle, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, IMPMC, 75005 Paris, France;3. Earth-Life Science Institute, Tokyo Institute of Technology, Meguro, Tokyo 152-8550, Japan;1. Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, 48824, USA;2. Department of Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI, 48109, USA |
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| Abstract: | Earth's core is believed to consist of a solid inner core and an outer liquid core. Since the inner core is mostly solid iron, most geophysical work has focused on melting of pure iron at core conditions. The inner core density is well matched with seismological data if some S is added to iron. The available phase equilibrium experimental data in the binary Fe–S system to pressures as high as ~200 GPa is used to create a thermodynamic database extending to core pressures that can be used to calculate the inner core density if S were the only other constituent. Such a calculation gives the maximum temperature of the solid inner core as 4428 (±500) K (363.85 GPa, density=13.09 g/cm3) with a sulfur content of ~15 wt%. To be consistent with the seismically determined density, the outer liquid core requires mixing of yet another light element or elements; both oxygen and carbon are suitable. |
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| Keywords: | Earth's core Fe–S binary Eutectic Temperature of the core |
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