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Magnetic collapse and low conductivity of Fe3N in the deep interiors of Earth-like planets

  • Yukai Zhuang ORCID logo , Jin Liu EMAIL logo , Chaojia Lv ORCID logo , Liangxu Xu , Wenli Bi , Qingyang Hu ORCID logo , Dongzhou Zhang ORCID logo , Gaston Garbarino , Shengcai Zhu EMAIL logo and Youjun Zhang ORCID logo
Published/Copyright: April 1, 2025
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Abstract

The high-pressure behavior of iron nitrides has garnered significant attention due to the potential of deep nitrogen reservoirs within the Earth’s interior. Here, we investigate the magnetic, structural, electrical, and thermal properties of Fe3N up to 62 GPa and 2100 K, using multiple probes (including synchrotron X-ray diffraction, synchrotron Mössbauer spectroscopy, and electrical measurements) coupled with the diamond-anvil cell technique. Fe3N undergoes a magnetic phase transformation from the ferromagnetic to paramagnetic state at ∼17–20 GPa, 300 K. The equation of state was determined as V0/Z = 42.8(1) Å3, and K0 = 151.8(1) GPa, with K' fixed at 4. Additionally, Fe3N exhibits unexpectedly low electrical and thermal conductivity under high-pressure and high-temperature conditions. This result suggests that deep nitrogen cycling may contribute to the thermal evolution of the deep interiors of Earth and other terrestrial bodies.


† Special collection papers can be found online at our website in the Special Collection section.


Acknowledgments and Funding

We acknowledge Yuming Xiao and Paul Chow for assistance with the experiment at beamline 16-IDD, APS, ANL. This work is supported by NSFC Grant no. 42072052, 42150102, 42150101, and the Sichuan Science and Technology Program (Grant No. 2023NSFSC1910). 13BM-C is partially supported by COMPRES under NSF Cooperative Agreement EAR-1606856. GeoSoilEnviroCARS is supported by the NSF-Earth Sciences (EAR-1634415) and the DOE-GeoSciences (DE-FG02-94ER14466). HPCAT operations are supported by DOE-NNSA’s Office of Experimental Sciences. This research used resources from the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Some experiments are supported by the Synergic Extreme Condition User Facility (SECUF).

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Received: 2023-11-15
Accepted: 2024-07-20
Published Online: 2025-04-01
Published in Print: 2025-04-28

© 2025 Mineralogical Society of America

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