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Equation of state of hydrous Fo90 ringwoodite to 45 GPa by synchrotron powder diffraction

Published online by Cambridge University Press:  05 July 2018

M. H. Manghnani ,
G. Amulele ,
J. R. Smyth ,
C. M. Holl ,
G. Chen ,
V. Prakapenka  and
D. J. Frost
M. H. Manghnani
Affiliation:
Hawaii Institute of Geophysics, University of Hawaii, Honolulu, HI 96822, USA
G. Amulele
Affiliation:
Hawaii Institute of Geophysics, University of Hawaii, Honolulu, HI 96822, USA
J. R. Smyth*
Affiliation:
Department of Geological Sciences, University of Colorado, Boulder, CO 80309, USA
C. M. Holl
Affiliation:
Department of Geological Sciences, University of Colorado, Boulder, CO 80309, USA
G. Chen
Affiliation:
Argonne National Laboratory, University of Chicago, Chicago IL 60637, USA
V. Prakapenka
Affiliation:
Argonne National Laboratory, University of Chicago, Chicago IL 60637, USA
D. J. Frost
Affiliation:
Bayerisches Geoinstitut, Universität Bayreuth, D95440 Bayreuth, Germany
*
*E-mail: joseph.smyth@colorado.edu
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Abstract

The equation of state of Fo90 hydrous ringwoodite has been measured using X-ray powder diffraction to 45 GPa at the GSECARS beam line at the Advanced Photon Source synchrotron at Argonne National Laboratory. The sample was synthesized at 1400°C and 20 GPa in the 5000 ton multi anvil press at Bayerisches Geoinstitut in Bayreuth. The sample has the formula Mg1.70Fe0.192+ Fe0.023+H0.13- Si1.00O4 as determined by electron microprobe, Fourier transform infrared and Mössbauer spectroscopies, and contains ~0.79% H2O by weight. Compression of the sample had been been measured previously to 11 GPa by single crystal X-ray diffraction. A third-order Birch-Murnaghan equation of state fit to all of the data gives V0 = 530.49±0.07 Å3, K0 = 174.6±2.7 GPa and K' = 6.2±0.6. The effect of 1% H incorporation in the structure on the bulk modulus is large and roughly equivalent to an increase in the temperature of ∼600°C at low pressure. The large value of K' indicates significant stiffening of the sample with pressure so that the effect of hydration decreases with pressure.

Keywords

equation of stateringwooditesynchrotronBirch-Murnaghan equation
Type
Research Article
Information
Mineralogical Magazine , Volume 69 , Issue 3 , June 2005 , pp. 317 - 323
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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