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Related Experiment Video

Updated: Apr 18, 2026

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
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New iron hydrides under high pressure.

Charles M Pépin1, Agnès Dewaele1, Grégory Geneste1

  • 1CEA, DAM, DIF, F-91297 Arpajon, France.

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|January 24, 2015
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Summary

Researchers discovered two new iron hydride (FeHx) compounds, FeH(~2) and FeH3, at high pressures using X-ray diffraction and calculations. These compounds exhibit large metastability, enabling equation of state measurements.

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Area of Science:

  • Materials Science
  • High-Pressure Physics
  • Solid-State Chemistry

Background:

  • The iron-hydrogen (Fe-H) system is crucial for understanding planetary cores and material properties under extreme conditions.
  • Previous investigations of the Fe-H system at high pressures have been limited, necessitating further exploration of its phase diagram and properties.

Purpose of the Study:

  • To investigate the Fe-H system at pressures up to 136 GPa.
  • To identify new iron hydride (FeHx) compounds and determine their crystal structures.
  • To measure the pressure-volume (P-V) equation of state for newly discovered FeHx phases.

Main Methods:

  • Combined experimental X-ray diffraction (XRD) studies with theoretical ab initio total energy calculations.
  • Laser annealing of hydrogen-embedded iron within a diamond anvil cell (DAC) to achieve high pressures.
  • Analysis of XRD data for unit cell and Fe positional parameters, complemented by calculations for H positions.

Main Results:

  • Discovery of two novel FeHx compounds at 67 GPa (FeH(~2)) and 86 GPa (FeH3).
  • Determination of crystal structures: tetragonal (I4/mmm) for FeH(~2) and simple cubic (Pm3m) for FeH3.
  • Observation of significant metastability in the FeHx compounds, allowing for P-V equation of state measurements at room temperature.

Conclusions:

  • The Fe-H system exhibits complex stoichiometry and structural diversity at high pressures.
  • The identified FeHx phases and their determined structures advance the understanding of hydrogen storage and behavior in iron-based materials.
  • The metastability of these phases is key for characterizing their fundamental thermodynamic properties.