Crystal morphology and dislocation microstructures of CaIrO3: A TEM study of an analogue of the MgSiO3 post-perovskite phase

Details Crystal morphology and dislocation microstructures of CaIrO3: A TEM study of an analogue of the MgSiO3 post-perovskite phase Crystal morphology and dislocation microstructures of CaIrO3: A TEM study of an analogue of the MgSiO3 post-perovskite phase

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3312302m&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 12, CiteID L12302

Physics

23

Mineralogy And Petrology: Mineral And Crystal Chemistry (1042), Mineralogy And Petrology: Petrography, Microstructures, And Textures, Mineralogy And Petrology: Experimental Mineralogy And Petrology, Mineral Physics: Creep And Deformation, Seismology: Mantle (1212, 1213, 8124)

Scientific paper

Polycrystalline CaIrO3 phase, synthesized in a cubic-anvil type high pressure apparatus at 4 GPa and 1473 K, has been investigated using transmission electron microscopy (TEM). Individual crystallites have a platy crystal habit elongated parallel to the crystallographic a-axis, which is the direction of the edge-shared octahedral chain. The dislocations with Burgers vectors b = [100] and $\langle$u0w$\rangle$ nucleated in the CaIrO3 phase during the synthesis experiments. The potential slip plane could be (010), the most likely having with the (010)-layered structure of IrO6 octahedrons. The crystal morphology and dislocation microstructures of CaIrO3 should provide important constraints for the discussion of the deformation behaviour and polarization anisotropy of the post-perovskite phase in the lowermost mantle.

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