Static compression of iron to 300 GPa and Fe0.8Ni0.2 alloy to 260 GPa: implications for composition of the core

H. K. Mao, Y. Wu, L. C. Chen, J. F. Shu, A. P. Jephcoat

Research output: Contribution to journalArticle

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Abstract

We report the results of X-ray diffraction experiments with the diamond anvil cell to pressures above 300 GPa at room temperature on pure iron and an iron-nickel alloy. These data extend throughout the pressure range of the bulk of the outer core of the Earth and provide for the first time direct pressure-volume measurements on geophysically important materials at such conditions. Both iron and iron-nickel are observed to remain in the hexagonal close-packed structure to the maximum pressures. Within the range of uncertainty in Earth model densities and trade-offs with the percentage light component in the core, nickel could be present in the core in an amount at least equal to its estimated abundance in the Earth. A direct comparison with (solid) inner core densities is now possible and places direct constraints on the thermal models of the Earth's interior. -from Authors

Original languageEnglish
JournalJournal of Geophysical Research
Volume95
Issue numberB13
Publication statusPublished - 1990
Externally publishedYes

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Iron
Earth (planet)
compression
iron
nickel
Nickel
Chemical analysis
Volume measurement
diamond anvil cell
outer core
Diamond
iron alloys
nickel alloys
Iron alloys
inner core
Nickel alloys
Pressure measurement
anvils
diamonds
X-ray diffraction

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Static compression of iron to 300 GPa and Fe0.8Ni0.2 alloy to 260 GPa : implications for composition of the core. / Mao, H. K.; Wu, Y.; Chen, L. C.; Shu, J. F.; Jephcoat, A. P.

In: Journal of Geophysical Research, Vol. 95, No. B13, 1990.

Research output: Contribution to journalArticle

Mao, H. K. ; Wu, Y. ; Chen, L. C. ; Shu, J. F. ; Jephcoat, A. P. / Static compression of iron to 300 GPa and Fe0.8Ni0.2 alloy to 260 GPa : implications for composition of the core. In: Journal of Geophysical Research. 1990 ; Vol. 95, No. B13.
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