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DOI	10.1016/j.epsl.2019.115974
	Elastic and magnetic properties of Fe3P up to core pressures: Phosphorus in the Earth's core
	Lai X.; Zhu F.; Liu Y.; Bi W.; Zhao J.; Alp E.E.; Hu M.Y.; Zhang D.; Tkachev S.; Manghnani M.H.; Prakapenka V.B.; Chen B.
发表日期	2020
ISSN	0012821X
卷号	531
英文摘要	Phosphorus (P) is considered a possible light element alloying with iron (Fe) in the Earth's core due to its siderophile nature and the ubiquity of P-bearing iron alloys in iron meteorites. The sequestration of P by liquid metals during the core formation possibly results in the relatively low concentration of P in the bulk silicate Earth. In this study, we performed single-crystal and powder X-ray diffraction, synchrotron Mössbauer spectroscopy and nuclear resonant inelastic X-ray scattering measurements in diamond anvil cells to investigate the elastic and magnetic properties of Fe3P under high pressures. Our X-ray diffraction results suggest that there is no structural phase transition up to 111 GPa. However, a volume collapse was observed at 21.5 GPa in Fe3P, ascribed to a magnetic transition as evidenced by synchrotron Mössbauer spectroscopy results. Fitting the volume-pressure data by the Birch-Murnaghan equation of state gives bulk modulus KT0=162.4(7) GPa, its first pressure derivative KT0 ′=4.0 (fixed) and zero-pressure volume V0=370.38(6) Å3 for the magnetic phase and KT0=220(7) GPa, KT0 ′=4.0 (fixed) and V0=357(1) Å3 for the non-magnetic phase. Sound velocities of Fe3P were determined up to 152 GPa by nuclear resonant inelastic X-ray scattering, demonstrating that Fe3P bears a low shear velocity and high Poisson's ratio at core pressures compared to Fe and Fe3S. When forming a solid solution Fe3(S,P) with Fe3S at core pressures, Fe3P may favorably influence the elastic properties of Fe3(S,P) to match the seismic observations of the inner core. © 2019 Elsevier B.V.
关键词	core composition density iron phosphide light elements magnetic transition sound velocities
英文关键词	Acoustic wave scattering; Acoustic wave velocity; Alloying elements; Density (specific gravity); Equations of state of solids; Iron alloys; Iron compounds; Magnetic properties; Magnetism; Shear flow; Silicates; Single crystals; X ray diffraction; X ray scattering; Birch-Murnaghan equation of state; Core composition; Iron phosphide; Light elements; Magnetic transitions; Resonant inelastic x-ray scattering; Single-crystal and powder; Structural phase transition; Sulfur compounds
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202713
作者单位	Hawai‘i Institute of Geophysics and Planetology, University of Hawai‘i at Mānoa, Honolulu, HI, United States; Gemmological Institute, China University of Geosciences, Wuhan, Hubei, China; School of Gemmology, China University of Geosciences, Beijing, China; Advanced Photon Source, Argonne National Laboratory, Chicago, IL, United States; Department of Physics, University of Alabama at Birmingham, Birmingham, AL, United States; Consortium for Advanced Radiation Sources, University of Chicago, Chicago, IL, United States
推荐引用方式 GB/T 7714	Lai X.,Zhu F.,Liu Y.,et al. Elastic and magnetic properties of Fe3P up to core pressures: Phosphorus in the Earth's core[J],2020,531.
APA	Lai X..,Zhu F..,Liu Y..,Bi W..,Zhao J..,...&Chen B..(2020).Elastic and magnetic properties of Fe3P up to core pressures: Phosphorus in the Earth's core.Earth and Planetary Science Letters,531.
MLA	Lai X.,et al."Elastic and magnetic properties of Fe3P up to core pressures: Phosphorus in the Earth's core".Earth and Planetary Science Letters 531(2020).