What question did this study set out to answer?

This study aims to map the phase diagram of FeS under high pressure and high temperature and derive its thermal equation of state.

FeS phase diagram and thermal Equation of State under high pressure

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Randomized trial establishes the FeS phase diagram and thermal equation of state, indicating implications for planetary cores.

This study aims to map the phase diagram of FeS under high pressure and high temperature and derive its thermal equation of state.
Used in situ x-ray diffraction measurements
Performed experiments in laser-heated diamond anvil cells
Investigated the FeS melting curve up to 100 GPa.
Identified second-order transition between FeS-VI and FeS-IV structures
Discovered novel phase FeS-IX above FeS-IV stability up to melting point
Established a thermal equation of state for FeS up to 150 GPa and 3000 K.

Morard et al. (2026) studied this question.

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