Physics and Chemistry of Minerals

, Volume 39, Issue 8, pp 613–626 | Cite as

Crystallographic preferred orientation in wüstite (FeO) through the cubic-to-rhombohedral phase transition

  • P. Kaercher
  • S. Speziale
  • L. Miyagi
  • W. Kanitpanyacharoen
  • H.-R. Wenk
Original paper


Magnesiowüstite, (Mg0.08Fe0.88)O, and wüstite, Fe0.94O, were compressed to ~36 GPa at ambient temperature in the diamond anvil cell (DAC) at the Advanced Light Source. X-ray diffraction patterns were taken in situ in radial geometry in order to study the evolution of crystallographic preferred orientation through the cubic-to-rhombohedral phase transition. Under uniaxial stress in the DAC, {100}c planes aligned perpendicular to the compression direction. The {100}c in cubic became {\(\left\{ {10\bar 14} \right\}\)}r in rhombohedral and remained aligned perpendicular to the compression direction. However, the {101}c and {111}c planes in the cubic phase split into {\({10{\bar{1}}4}\)}r and {\({11{\bar{2}}0}\)}r, and (0001)r and {\({10{\bar{1}}1}\)}r, respectively, in the rhombohedral phase. The {\({11{\bar{2}}0}\)}r planes preferentially aligned perpendicular to the compression direction while {\({10{\bar{1}}4}\)}r oriented at a low angle to the compression direction. Similarly, {\({10{\bar{1}}1}\)}r showed a slight preference to align more closely perpendicular to the compression direction than (0001)r. This variant selection may occur because the 〈\({10{\bar{1}}4}\)r and [0001]r directions are the softer of the two sets of directions. The rhombohedral texture distortion may also be due to subsequent deformation. Indeed, polycrystal plasticity simulations indicate that for preferred {\({10{\bar{1}}4}\)}〈\({1{\bar{2}}10}\)r and {\({11{\bar{2}}0}\)}〈\({{\bar{1}}101}\)r slip and slightly less active {\({10{\bar{1}}1}\)}〈\({{\bar{1}}2{\bar{1}}0}\)r slip, the observed texture pattern can be obtained.


Wüstite Preferred orientation Diamond anvil cell Phase transition 



Pamela Kaercher is grateful for partial support from the Francis J. Turner Fellowship. We also thank the Carnegie/Department of Energy Alliance Center (CDAC) and the National Science Foundation (EAR-0836402) for financial support and the Advanced Light Source of Lawrence Berkeley National Laboratory for the use of beamline 12.2.2. Samples were provided by Yingwei Fei via Ho-kwang Mao, and Steven Jacobsen. We appreciate assistance with the experiments from Hauke Marquardt, Sebastian Merkel, and Jason Knight. Carlos Tomé developed the viscoplastic self-consistent code used here to determine slip systems. We are appreciative to constructive comments from reviewers.


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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • P. Kaercher
    • 1
  • S. Speziale
    • 2
  • L. Miyagi
    • 3
  • W. Kanitpanyacharoen
    • 1
  • H.-R. Wenk
    • 1
  1. 1.Department of Earth and Planetary ScienceUniversity of CaliforniaBerkeleyUSA
  2. 2.Helmholtz CenterGFZ German Research Centre for GeosciencesPotsdamGermany
  3. 3.Department of Geology and GeophysicsUniversity of UtahSalt Lake CityUSA

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