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Mineralogical Magazine; June 2005; v. 69; no. 3; p. 317-323; DOI: 10.1180/0026461056930253
© 2005 Mineralogical Society of Great Britain and Ireland
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Equation of state of hydrous Fo90 ringwoodite to 45 GPa by synchrotron powder diffraction

M. H. Manghnani1, G. Amulele1, J. R. Smyth2,*, C. M. Holl2, G. Chen3, V. Prakapenka3 and D. J. Frost4

1 Hawaii Institute of Geophysics, University of Hawaii, Honolulu, HI 96822, USA
2 Department of Geological Sciences, University of Colorado, Boulder, CO 80309, USA
3 Argonne National Laboratory, University of Chicago, Chicago IL 60637, USA
4 Bayerisches Geoinstitut, Universität Bayreuth, D95440 Bayreuth, Germany

* E-mail: joseph.smyth{at}colorado.edu

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 Mg1.70Fe2+0.19Fe3+0.02H0.13-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 state, ringwoodite, synchrotron, Birch-Murnaghan equation




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Effect of Water on the Equation of State of Nominally Anhydrous Minerals
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