Dislocation microstructures of MgSiO3 perovskite at a high pressure and temperature condition

Details Dislocation microstructures of MgSiO3 perovskite at a high pressure and temperature condition Dislocation microstructures of MgSiO3 perovskite at a high pressure and temperature condition

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pepi..174..153m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 174, Issue 1-4, p. 153-158.

Physics

1

Scientific paper

Dislocation microstructures of polycrystalline MgSiO3 perovskite, synthesized in a multi-anvil type high-pressure apparatus at 26 GPa and 2023 K for 600 min, have been investigated using transmission electron microscopy (TEM). The recovered MgSiO3 perovskite displayed deformation lamellae under cross-polarized optical microscopy, suggesting that the sample was deformed during the high-pressure experiment. TEM observations showed that curved dislocations with Burgers vectors lying in the {1 1 0} plane, potentially b = <1 1 0> and [00w] (orthorhombic symmetry) were nucleated. Low-angle tilt boundaries controlled by <1 1 0> dislocation climb were also activated at high temperature and pressure. The potential Burgers vector of b = <1 1 0> is consistent with previous results of slip to <1 0 0>cubic, [1 0 0]pc and [0 1 0]pc (cubic symmetry and pseudo-cubic symmetry) on non-silicate perovskite analogues deformed at high temperatures and ambient pressure. The microstructures of climb-accommodated dislocation creep controlled by diffusion in the MgSiO3 perovskite can provide useful information on the rheology at high temperatures and slow strain rates corresponding to the Earth's lower mantle.

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