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March 29, 2026Geophysical Research LettersOpen Access

Sulfur‐Bearing hcp Iron for Earth's Inner Core

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Authors

ESEmiko Sugimura‐KomabayashiUniversity of EdinburghSTSamuel ThompsonStanford UniversityTKTetsuya KomabayashiUniversity of Edinburgh

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Implication

This research examines the influence of sulfur on the density of iron in Earth's inner core, suggesting implications for its composition.

Key Points

  • To investigate how sulfur affects the density of hexagonal close-packed iron and constrain Earth's core composition.
  • Utilized laser-heated diamond anvil cells for high-pressure experiments
  • Conducted in situ synchrotron X-ray diffraction to measure density
  • Analyzed unit-cell volume for varying sulfur concentrations at different temperatures
  • 2 wt% sulfur-bearing hcp iron shows similar density to pure iron at 300 K
  • At high temperatures, sulfur-bearing hcp iron is less dense than pure iron under core pressures
  • Developed a core model with specific compositions for outer and inner cores supporting equilibrium scenarios

Cite This Study

Sugimura‐Komabayashi et al. (2026) studied this question.

synapsesocial.com/papers/69c8c324de0f0f753b39dcb1https://doi.org/10.1029/2025gl121618
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