DOI: 10.1016/j.epsl.2019.115974
论文题名: Elastic and magnetic properties of Fe3P up to core pressures: Phosphorus in the Earth's core
作者: 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.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 531 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165091
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Earth and Planetary Science Letters,2020-01-01,531