Physics and Chemistry of Minerals

, Volume 22, Issue 2, pp 99–107

Compression and amorphization of (Mg,Fe)2SiO4 olivines: An X-ray diffraction study up to 70 GPa

  • D. Andrault
  • M. A. Bouhifd
  • J. P. Itié
  • P. Richet
Article

DOI: 10.1007/BF00202469

Cite this article as:
Andrault, D., Bouhifd, M.A., Itié, J.P. et al. Phys Chem Minerals (1995) 22: 99. doi:10.1007/BF00202469
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Abstract

The effect of (Mg,Fe) substitution on the compression and pressure-induced amorphization of olivines has been investigated up to more than 50 GPa in a diamond anvil cell through energy-dispersive X-ray diffraction experiments with synchrotron radiation. For the four (Mg1−x, Fex)2SiO4 olivines studied, the compressibility is the highest along the b axis and the smallest along the a axis. For compositions with x = 0, 0.17, 0.66, and 1, the slope of the volume-pressure curves shows a rapid decrease at pressures of around 42, 34, 20 and 10 GPa, respectively. Assuming K0 = 4, we obtained at lower pressures with a Birch-Murnaghan equation of state essentially the same room-pressure bulk modulus for all olivines, namely K0 = 131 ± 6 GPa, in agreement with previous single-crystal compression and ultrasonic measurements. At higher pressures, the compression becomes nearly isotropic and the materials very stiff. These changes could precede partial transformation of olivines to a high-pressure polymorph related to the spinel structure. Only a small fraction of olivines seems to transform actually to this phase, however, because most of the material undergoes instead pressure-induced amorphization which take place at considerably higher pressures for Mg-than for Fe-rich olivines.

Copyright information

© Springer-Verlag 1995

Authors and Affiliations

  • D. Andrault
    • 1
  • M. A. Bouhifd
    • 1
  • J. P. Itié
    • 2
  • P. Richet
    • 1
  1. 1.Institut de Physique du Globe, URA CNRS 734Paris Cedex 05France
  2. 2.Laboratoire de Physique des Milieux CondensésUniversité Paris 6Paris Cedex 05France

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