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Crystal morphology and dislocation microstructures of CaIrO 3 : A TEM study of an analogue of the MgSiO 3 post‐perovskite phase
Author(s) -
Miyajima Nobuyoshi,
Ohgushi Kenya,
Ichihara Masaki,
Yagi Takehiko
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2005gl025001
Subject(s) - crystallite , crystallography , microstructure , materials science , dislocation , transmission electron microscopy , anisotropy , platy , post perovskite , octahedron , crystal (programming language) , burgers vector , phase (matter) , crystal structure , condensed matter physics , perovskite (structure) , geology , mineralogy , composite material , mantle (geology) , optics , nanotechnology , chemistry , geophysics , physics , programming language , organic chemistry , computer science
Polycrystalline CaIrO 3 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 CaIrO 3 phase during the synthesis experiments. The potential slip plane could be (010), the most likely having with the (010)‐layered structure of IrO 6 octahedrons. The crystal morphology and dislocation microstructures of CaIrO 3 should provide important constraints for the discussion of the deformation behaviour and polarization anisotropy of the post‐perovskite phase in the lowermost mantle.