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

Nobuyoshi Miyajima, Kenya Ohgushi, Masaki Ichihara, Takehiko Yagi

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49 Citations (Scopus)

Abstract

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 (u0w) 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.

Original languageEnglish
Article numberL12302
JournalGeophysical Research Letters
Volume33
Issue number12
DOIs
Publication statusPublished - 2006 Jun 28

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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