Observation of Cation Reordering during the Olivine-Spinel Transition in Fayalite byIn SituSynchrotron X-Ray Diffraction at High Pressure and Temperature
Year: 2001
Type: article
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.
Source: Physical Review Letters
Institutions: State University of New York, Stony Brook University
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1968007251