Physics and Chemistry of Minerals

, Volume 33, Issue 2, pp 84–97 | Cite as

Texture development and elastic stresses in magnesiowűstite at high pressure

  • Caterina E. Tommaseo
  • Jim Devine
  • Sébastien Merkel
  • Sergio Speziale
  • Hans-Rudolf Wenk
Original Paper

Abstract

Cubic magnesiowűstite has been deformed in a diamond anvil cell at room temperature. We present results for (Mg0.4Fe0.6)O, (Mg0.25Fe0.75)O, and (Mg0.1Fe0.9)O up to 37, 16, and 18 GPa, respectively. The diffraction images, obtained with the radial diffraction technique, are analyzed using both single peak intensities and a Rietveld method. For all samples, we observe a [100] fiber texture but the texture strength decreases with increasing iron content. This texture pattern is consistent with {110}〈1-10〉 slip. The images were also analyzed for stress, elastic strains, and elastic anisotropy. In general, the stress measured in magnesiowűstite samples is lower than previously measured on MgO. The elastic anisotropy deduced from the X-ray measurements shows a broad agreement with models based on measurements with other techniques.

Keywords

(Mg,Fe)O Texture DAC Synchrotron X-rays Deformation mechanisms Magnesiowűstite Elasticity 

Notes

Acknowledgement

C.E.T. thanks the DFG (TO257/3–1) for financial support. This work was supported by NSF and CDAC. We are appreciative for access to the facilities at APS and ALS. We acknowledge help by M. Kunz and L. Miyagi with the experiment and Ivan Lonardelli, Gloria Ischia, Ingwar Huensche, and Jenny Pehl with MAUD data analysis and fruitful discussions. Comments on the manuscript by reviewers were very helpful. We also thank R. Jeanloz for providing some of the samples used in the experiments.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Caterina E. Tommaseo
    • 1
  • Jim Devine
    • 2
  • Sébastien Merkel
    • 1
  • Sergio Speziale
    • 1
  • Hans-Rudolf Wenk
    • 1
  1. 1.Department of Earth and Planetary ScienceUniversity of CaliforniaBerkeleyUSA
  2. 2.University of Chicago, Geophysical ScienceChicagoUSA

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