The compressibility of Fe- and Al-bearing phase D to 30 GPa

Konstantin D. Litasov, Eiji Otani, Akio Suzuki, Kenichi Funakoshi

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

High-pressure in situ X-ray diffraction experiment of Fe- and Al-bearing phase D (Mg0.89Fe0.14Al0.25 Si1.56H2.93O6) has been carried out to 30.5 GPa at room temperature using multianvil apparatus. Fitting a third-order Birch-Murnaghan equation of state to the P-V data yields values of V0 = 86.10 ± 0.05 Å3; K0 = 136.5 ± 3.3 GPa and K′ = 6.32 ± 0.30. If K′ is fixed at 4.0 0 = 157.0 ± 0.7 GPa, which is 6% smaller than Fe-Al free phase D reported previously. Analysis of axial compressibilities reveals that the c-axis is almost twice as compressible Kc = 93.6 ± 1.1 GPa) as the a-axis (Ka = 173.8 ± 2.2 GPa). Above 25 GPa the c/a ratio becomes pressure independent. No compressibility anomalies related to the structural transitions of H-atoms were observed in the pressure range to 30 GPa. The density reduction of hydrated subducting slab would be significant if the modal amount of phase D exceeds 10%.

Original languageEnglish
Pages (from-to)159-167
Number of pages9
JournalPhysics and Chemistry of Minerals
Volume34
Issue number3
DOIs
Publication statusPublished - 2007 Apr 1

Keywords

  • Equation of state
  • High pressure
  • Phase D
  • Synchrotron radiation

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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