Physics and Chemistry of Minerals

, Volume 34, Issue 3, pp 159–167 | Cite as

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

  • Konstantin D. Litasov
  • Eiji Ohtani
  • Akio Suzuki
  • Kenichi Funakoshi
Original Paper

Abstract

High-pressure in situ X-ray diffraction experiment of Fe- and Al-bearing phase D (Mg0.89Fe0.14Al0.25Si1.56H2.93O6) 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 V 0 = 86.10 ± 0.05 Å3; K 0 = 136.5 ± 3.3 GPa and K′ = 6.32 ± 0.30. If K′ is fixed at 4.0 K 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 (K c  = 93.6 ± 1.1 GPa) as the a-axis (K a  = 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%.

Keywords

Phase D Equation of state High pressure Synchrotron radiation 

Notes

Acknowledgments

We thank J. Bass, T. Shinmei and one anonymous reviewer for thorough reviews and corrections of the manuscript. We thank to S. Ghosh, H. Terasaki, K. Nishida and T. Sakamaki for assistance during experiments at ‘SPring-8’ and to T. Shinmei for data exchange prior to publication. This work was supported by the grants in Aid for Scientific Researches from the Ministry of Education, Culture, Sports, Science and Technology, Japan (No. 14102009 and 16075202), to EO and Vacate B grant from Japan Society for Promotion of Science (No. 17740344) to KL. This work was conducted under the Spring-8 proposal No 2005A0772-ND2b-np and is a part of the 21st Century Center-of-Excellence program ‘Advanced Science and Technology Center for the Dynamic Earth’ at Tohoku University.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Konstantin D. Litasov
    • 1
  • Eiji Ohtani
    • 1
  • Akio Suzuki
    • 1
  • Kenichi Funakoshi
    • 2
  1. 1.Institute of Mineralogy, Petrology and Economic Geology, Faculty of ScienceTohoku University, Aoba-kuSendaiJapan
  2. 2.SPring-8Japan Synchrotron Radiation Research Institute, KoutoHyogoJapan

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