Density of FeS up to the Martian core condition using the X-ray absorption method with laser-heated diamond anvil cell: implication to the Martian core structure
Abstract
A relationship between density of solid FeS and that of coexisting liquid Fe–S is crucial for understanding the Martian core structure. In the sulfur-rich Martian core (S > 25 wt%), FeS could be a liquidus phase. In this study, the density of FeS V phase was measured using the X-ray absorption method combined with a laser-heated DAC up to 26 GPa and 1950K. The density from the X-ray absorption method is consistent with that from X-ray diffraction (0.04–2.82% in difference). The density of FeS is found to be lower than that of the liquid Fe–30wt%S at the Martian core pressures. Therefore, solid FeS could float in the liquid Fe–S core. The solid FeS outer core may influence the weak Martian magnetic field. If Mars has a solid inner core, FeS is excluded from the liquidus phases in the core, indicating that the sulfur content in the core is constrained to be
Fields of Study & Subjects
Planetary Science and Exploration
High-pressure geophysics and materials
Astro and Planetary Science
Publication details
- Journal / source
- High Pressure Research
- Publisher
- Informa UK Limited
- Volume
- 46
- Issue
- 1
- Pages
- 90–106
- Publication date
- 2 January 2026
- Language
- EN