Single-crystal synchrotron X-ray diffraction study of wüstite and magnesiowüstite at lower-mantle pressures

Steven D. Jacobsen*, Jung Fu Lin, Ross J. Angel, Guoyin Shen, Vitali B. Prakapenka, Przemyslaw Dera, Ho Kwang Mao, Russell J. Hemley

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

This study demonstrates the use of monochromatic synchrotron X-ray radiation of 40 keV for high-precision equation-of-state studies on sets of single crystals analysed individually in the same diamond-anvil pressure cell. Angle-dispersive zone-axis diffraction patterns were obtained from crystals of wustite-Fe0.93O and magnesiowüstite-(Mg0.73Fe 0.27)O to 51 GPa in a hydrostatic helium pressure medium. The rhombohedral phase of Fe0.93O was observed above 23 GPa, and its isothermal bulk modulus (K0) was determined to be 134 (±4) GPa, assuming K′ = 4. The rhombohedral phase of Fe0.93O is more compressible than B1-structured Fe0.93O, with K0 = 146 (±2) GPa. Magnesiowüstite-(Mg0.73Fe0.27)O remains cubic over the experimental pressure range, and has a bulk modulus of 154 (±3) GPa with K′ = 4.0 (±0.1).

Original languageEnglish (US)
Pages (from-to)577-583
Number of pages7
JournalJournal of Synchrotron Radiation
Volume12
Issue number5
DOIs
StatePublished - Sep 1 2005

Keywords

  • Diamond-anvil cell
  • Equation of state
  • Helium pressure medium
  • Magnesiowüstite
  • Megabar
  • Single-crystal X-ray diffraction
  • Wüstite
  • Zone-axis diffraction

ASJC Scopus subject areas

  • Radiation
  • Nuclear and High Energy Physics
  • Instrumentation

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