Observation of Cation Reordering during the Olivine-Spinel Transition in Fayalite by In Situ Synchrotron X-Ray Diffraction at High Pressure and Temperature

Phys. Rev. Lett. 86, 4072 – Published 30 April 2001
Jiuhua Chen, Donald J. Weidner, John B. Parise, Michael T. Vaughan, and Paul Raterron

Abstract

The olivine-spinel phase transition in fayalite at high pressure and temperature has been studied using time-resolved x-ray diffraction. Structure refinements show a delay of cation reordering relative to anions during the phase transformation and an increase in the cell volume while the cations reorder into their sites. A significant stress drop in the sample is observed. This experiment, for the first time, quantitatively demonstrates a pseudomartensitic transformation: a diffusionless anion sublattice transition coupled with short-range diffusional cation reordering.

DOI: http://dx.doi.org/10.1103/PhysRevLett.86.4072

  • Received 26 September 2000
  • Published in the issue dated 30 April 2001

© 2001 The American Physical Society

Authors & Affiliations

Jiuhua Chen, Donald J. Weidner, John B. Parise, Michael T. Vaughan, and Paul Raterron

  • Center for High Pressure Research, Department of Geosciences, State University of New York at Stony Brook, Stony Brook, New York 11794-2100

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