Spin Transitions and Compressibility of ε-Fe7N3 and γ'-Fe4N: Implications for Iron Alloys in Terrestrial Planet Cores

Lv, Mingda; Liu, Jiachao; Zhu, Feng; Li, Jie; Zhang, Dongzhou; Xiao, Yuming; Dorfman, Susannah M.

doi:10.1029/2020jb020660

Title: Spin Transitions and Compressibility of ε-Fe₇N₃ and γ'-Fe₄N: Implications for Iron Alloys in Terrestrial Planet Cores

Journal Article · Sat Oct 24 00:00:00 EDT 2020 · Journal of Geophysical Research. Solid Earth

DOI:https://doi.org/10.1029/2020jb020660· OSTI ID:1775105

^[1]; Liu, Jiachao ^[2];

^[3];

^[4];

^[5]; Xiao, Yuming ^[6];

^[1]

Michigan State Univ., East Lansing, MI (United States)
Michigan State Univ., East Lansing, MI (United States); Peking Univ., Beijing (China)
Univ. of Michigan, Ann Arbor, MI (United States); Univ. of Hawaii at Manoa, Honolulu, HI (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
Univ. of Hawaii at Manoa, Honolulu, HI (United States); Univ. of Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Iron nitrides are possible constituents of the cores of Earth and other terrestrial planets. Pressure-induced magnetic changes in iron nitrides and effects on compressibility remain poorly understood. Here we report synchrotron X-ray emission spectroscopy (XES) and X-ray diffraction (XRD) results for ε-Fe7N3 and γ'-Fe₄N up to 60 GPa at 300 K. The XES spectra reveal completion of high- to low-spin transition in ε-Fe₇N₃ and γ'-Fe₄N at 43 and 34 GPa, respectively. The completion of the spin transition induces stiffening in bulk modulus of ε-Fe₇N₃ by 22% at similar to 40 GPa, but has no resolvable effect on the compression behavior of γ'-Fe₄N. Fitting pressure-volume data to the Birch-Murnaghan equation of state yields V₀ = 83.29 ± 0.03 (Å³), K₀ = 232 ± 9 GPa, K₀' = 4.1 ± 0.5 for nonmagnetic ε-Fe₇N₃ above the spin transition completion pressure, and V₀ = 54.82 ± 0.02 (Å³), K₀ = 152 ± 2 GPa, K₀' = 4.0 ± 0.1 for γ'-Fe₄N over the studied pressure range. By reexamining evidence for spin transition and effects on compressibility of other candidate components of terrestrial planet cores, Fe₃S, Fe₃P, Fe₇C₃, and Fe₃C based on previous XES and XRD measurements, we located the completion of high- to low-spin transition at similar to 67, 38, 50, and 30 GPa at 300 K, respectively. The completion of spin transitions of Fe₃S, Fe₃P, and Fe₃C induces elastic stiffening, whereas that of Fe₇C₃ induces elastic softening. Changes in compressibility at completion of spin transitions in iron-light element alloys may influence the properties of Earth's and planetary cores.

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Research Organization:: Univ. of Illinois, Chicago, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); National Science Foundation (NSF). Directorate for Geosciences Division of Earth Sciences (GEO/EAR)

Grant/Contract Number:: NA0003975; FG02-94ER14466; AC02-06CH11357; EAR-1751664; EAR-1763189; AST-1344133; EAR-1634415; EAR-1606856; DE‐FG02‐94ER14466

OSTI ID:: 1775105

Alternate ID(s):: OSTI ID: 1786779; OSTI ID: 1797961

Journal Information:: Journal of Geophysical Research. Solid Earth, Vol. 125, Issue 11; ISSN 2169-9313

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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