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6CCVD Research

The iron spin transition of deep nitrogen-bearing mineral Fe3N1.2 at high pressure

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2022-06-30
JournalAmerican Mineralogist
AuthorsChaojia Lv, Jin Liu
InstitutionsCenter for High Pressure Science and Technology Advanced Research
Citations2

Abstract

Section titled ā€œAbstractā€

Abstract Nitrogen is an essential element for life, one of the most abundant volatiles in the atmosphere, and an important component in the Earthā€™s interior, where iron nitride is an essential host of deep nitrogen. Here, we investigate the pressure-induced electronic spin-pairing transition of iron in siderazot (Fe3N1.2) at pressures up to 45.8 GPa at room temperature, using diamond-anvil cell techniques coupled with synchrotron X-ray emission spectroscopy. The integrated intensity of the satellite emission peak (Kā€²Ī²) decreases upon compression but remains unchanged at pressures greater than 30.5 GPa. In other words, the high-spin to low-spin transition of iron in Fe3N1.2 starts immediately at very low pressures and completes at ~30.5 GPa. The iron spin transition completion pressures increase with the nitrogen concentration of hexagonal close-packed iron nitrides (i.e., Fe3N1.2, Fe7N3, and Fe2N). Moreover, the identity and concentration of light elements in binary iron-rich compounds such as Fe3N, Fe3C, Fe3P, Fe3S, Fe7C3, and Fe7N3, together with their crystal structure, could affect the iron spin transition pressures. The spin transition of iron-rich alloys could alter the bonding nature and the physical properties, including the thermal and electrical conductivity, thereby influencing the thermal state and evolution of planetary interiors.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2005 - A high-pressure X-ray diffraction study of iron nitrides: Implications for Earthā€™s core [Crossref]
  2. 2015 - Tracing the ingredients for a habitable earth from interstellar space through planet formation [Crossref]
  3. 2021 - Confirmation of siderazot, Fe3N1.33, the only terrestrial nitride mineral
  4. 2016 - Crystal structures of core materials [Crossref]
  5. 2014 - Hidden carbon in Earthā€™s inner core revealed by shear softening in dense Fe7C3 [Crossref]
  6. 2018 - Experimental constraints on the sound velocities of cementite Fe3C to core pressures [Crossref]
  7. 2017 - Nitrogen and carbon fractionation during core-mantle differentiation at shallow depth [Crossref]
  8. 2019 - Redox control on nitrogen isotope fractionation during planetary core formation [Crossref]
  9. 1981 - Preliminary reference Earth model [Crossref]
  10. 2014 - High-pressure behavior of Fe3P and the role of phosphorus in planetary cores [Crossref]

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