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Sound velocities of iron‐nickel and iron‐silicon alloys at high pressures
Author(s) -
Lin JungFu,
Struzhkin Viktor V.,
Sturhahn Wolfgang,
Huang Eugene,
Zhao Jiyong,
Hu Michael Y.,
Alp Ercan E.,
Mao Hokwang,
Boctor Nabil,
Hemley Russell J.
Publication year - 2003
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2003gl018405
Subject(s) - nickel , silicon , materials science , shear (geology) , scattering , inner core , metallurgy , composite material , optics , physics
Understanding the alloying effects of nickel and light element(s) on the physical properties of iron under core conditions is crucial for interpreting and constraining geophysical and geochemical models. We have studied two alloys, Fe 0.92 Ni 0.08 and Fe 0.85 Si 0.15 , with nuclear resonant inelastic x‐ray scattering up to 106 GPa and 70 GPa, respectively. The sound velocities of the alloys are obtained from the measured partial phonon density of states for 57 Fe incorporated in the alloys. Addition of Ni slightly decreases the compression wave velocity and shear wave velocity of Fe under high pressures. Silicon alloyed with Fe increases the compressional wave velocity and shear wave velocity under high pressures, which provides a better match to seismological data of the Earth's core.