Phys. Rev. Lett. 86, 4072–4075 (2001)Observation of Cation Reordering during the Olivine-Spinel Transition in Fayalite by In Situ Synchrotron X-Ray Diffraction at High Pressure and TemperatureReceived 26 September 2000; published in the issue dated 30 April 2001 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. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.86.4072
DOI:
10.1103/PhysRevLett.86.4072
PACS:
81.30.Hd, 61.10.-i, 61.50.Ks, 81.30.Kf
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